Theres a lot of variations but the most common is probably the vampire dexxer.
This is not a template but skills that help you be at the top:
Bushido - Perfection, lightning strike, momentum strike.
Parry (with Bushido) - Counter attack, evasion. (evasion is still very viable)
Necro only - Vamp form.
Necro with Spirit speak - Wraith form & curse weapon.
Ninjitsu - Mirror images, cat/dog forms, sometimes other forms too.
Chivalry - Enemy of one, consecrate, divine fury, close wounds, cleanse by fire, remove curse.
Discord.
Archery - Purely for ranged ability makes suit easier to build but loses out in swing speed (usually) plus other parts like the bushido/parry combinations.
The - vamp form -
It depends in part on items, some people have minimum necro for vamp form (35 I think) & carry all the items around with them in case they need to re cast it in the field. I personally always use 90 necro so I only carry the blessed book and a vamp form scroll or insured arcane clothing (arcane clothing lets you cast 1 necro spell per charge and can have 20+ charges - depends on the tailors skill) The vamp form does several things, stamina regen 15, mana regen 3, poisons 1-4 cure themselfs on the first tick and the main purpose 20% life leech. This life leech is calculated differently from hit leech property on weapons in that it is literally 20% of the damage every swing. So if you hit 100 damage you leech 20 life back. Which makes two other things important, hitting at maximum swing 1.25s and hitting for as much damage as possible 300% DI.
The - weapon -
Picking the right weapon skill & weapon is also important as you will want to be able to easily reach the swing cap, some skills like fencing reach that easily but lose out on base damage because of it, archery often loses out on speed but has higher damage. There are two weapons which stand out as far as being well balanced in both go and those are diamond maces (macing) & ornate axes (swords). However diamond maces allow you to reach the swing cap at a lower level of stamina and ssi on the weapon, which makes finding the right weapon easier. Ornate axes might be preferable on a template using healing as 140+ dex would benefit both. Though I personally hate the healing skill so never use it. The first place I read about vampire dexxers was on the bushido profession forum, a post by someone called baghdad (sp) who was using bandages/ornate axe and soloing dreadhorn and paroxysmus'. So it's just a matter of preference and availability of weapons.
Oh theres also the option of archery which has the nice benefit of needing no dci (assuming your good enough at keeping ranged).
The main thing you need on your weapon on top of this is mana leech.
Specials, depending on what your attempting to solo are pretty much not needed. On things like shimmering feint is used to half it's damage that requires the wraith version to maintain the mana.
The - damage -
First of all taking damage/not dying to high end mobs theres a lot of choices. First of all use an armoured swamp dragon or paroxysmus' swamp dragon. Bushido/parry and using evasion which although has a 20s cooldown is still very handy. Ninjitsu in some situations can also allow you to kill top end stuff. These are mirror images and cat/dog form. You can hop off your mount cast mirror images and get back on your mount, though most of the time thats unnecessary. Mirror images divert melee attacks at the rate of ninjitsu skill - 30. So at 120 skill you will divert 90% of the time. This can allow you to go toe to toe with some of the heaviest hitting monsters in the game, when you sucessfully divert the monsters loses his target and you continue to swing. I liken it to targeted peace but for half the skill points. Cat/dog form have a high hp regen formula which is ninjitsu skill divided by 3. So at 120 thats 40 hp regen (4 hp per second), you can equip 18 and if your human you get another 2 so you could have up to 60 hp regen.
Using ninjitsu like this does well when coupled with 4/6 casting so you can change forms quickly if needed. Lastly resist spells, a lot of people don't bother with it. I always have 100 minimum for pvm. The only time I don't is on paroxysmus' where I stone it off for anatomy for extra damage.
Trying to hit 300% DI can include, enemy of one (50), slayer weapon (100), perfection (100), items including weapon (100). Not entirely sure if the items cap in relation to the 300% cap is 100 or not but thats roughly what you need to consider when aiming high. There is no slayer for any of the peerless afaik. Lightning strike can also critical hit, I don't know the details on it's damage. LS also has the handy advantage of giving 50 hci which is why mana leech is necessary on vampire versions. Counter attack helps build/maintain perfection if you have parry to use it and also works like an additional swing between your normal swings. When soloing paroxysmus for example it's very possible to hit well over 400 damage in one swing with the counter attack going off at the same time as a critical hit etc.
Momentum strike also helps a great deal on the melee versions for things like dark fathers. Bushido has some things that can be toggled on at the same time and some that can't it's a good idea to figure out which can before trying anything too hard. Momentum strike combined with counter attack can take out 8 enemies very quickly and easily keep you alive in the process. Useful in doom & invasions etc.
Wraith form & curse weapon, curse weapon is 50% life leech that does stack with vamp form but most people play one or the other. I personally see it as a trade off the vamp version gets the mount so takes less damage but leeches less, the wraith version doesn't get the damage reduction mount so takes more but also heals more. The wraith version also requires you to have spirit speak to leech mana and imo is the harder suit to build. Also as your continually using curse weapon in wraith form your karma will affect your chivalry spell duration (if you use chiv on it that is). The wraith version also has a the disadvantage of leeching the opponents mana pool rather than converting damage in to health which to me is a huge disadvantage as some things can't be leeched from and those that do can run out. (e.g. mel can run out, I've never seen shimmering run out) The wraith form version also does well with tactics like spamming whirlwind and can let you tank riddiculous groups of spawn that would normally flatten you.
Thats pretty much everything, you can build a 4/6 chiv discord bush vamp dexxer, you can build a 4/6 chiv spellweaving vampire bush archer. I've seen many variations, Some combining all of those plus ninjitsu. A lot of it depends on the weapon you can get, having a weapon thats 100% in the right damage type for what your fighting can also save you having to cast consecrate which helps if you have little/no casting on your jewlery when switching between that and bushido moves etc. It helps to know before hand, that paroxysmus for example hits physical and poison only as do the bulbous putrifiers so you can forget fire/cold/energy resist if aiming just to do him and both him and the bulbous are weakest to fire so a 100% fire weapon helps. Invis pots are always useful for getting down there without leading extra stuff. To take out all three bulbous putrifiers before monster ignore wears off level two or higher honor virtue (depending on your wep/damage) is also useful as you don't want to be enemy of one on those while paroxysmus takes a swing at you.
Probably the easiest to build skills & suit for is the bush/vampire dexxer.
(sorry for the really long post just a lot I didn't see covered)
I just learned a lot from reading this post. I also learned why I am scared of PvP. There is SO MUCH I have yet to learn and master just to survive. 
