I would go full Necro (meaning ability to use all the spells), however, you don't need 120. I would recommend 100 Necro* (105 if it's going to PvP at any point) and 100 SS. The benefits are many, plus I like to truly embrace the nature of a character. My Necro/Mage is locked karma and purposely as low as possible, and yes, I still do Oaks, Fey books on a Necro/Scribe/Mage do great damage.
*100 Necro gives you 100% success at Wither, 105 gives you 100% with Strangle, you don't need more than that as Revenants aren't that good.
Just think... you can Corpse Skin and use 100% Fire/Poison weapons.
I would definitely have 120 Bushido.
I would most likely go Mace Fighting. Because Strangle does more damage against Fatigue and Maces damage Stamina. Alternatively Fencing, for Leafblades Feint/AI.
I would definitely build 100 LRC into the suit. (It can very easily be done still maxing out everything necessary. I did it before legendaries and reforging existed on the Stone Form dexxer for soloing the Slasher.)
It's a LOT of fun to play a character NOT playing it like it's just another sampire. Relegate Bushido's use for perfection and utilize the true potential of the template, the Necro side. All the forms, bond a pair of Bake Kitsune's (800 mana dumping power, and high resists - you can tank while they attack or if you're any good with your positioning and macros you can have them kill/stay and dump from a distance) for when you don't have any Undead with you. Don't forget you can't actually recall with Skeletal Dragons as you can't bond them, you have to gate them around, it's fine if it's for a guild hunt where you have someone to help you out. You can also command Rotting Corpses which has uses...
I would start with the base idea of:
120 Weapon
90 Tactics
120 Bushido (or however much CorwinXX says is adequate for perfection... I think 90?)
100 Necro
100 SS
That leaves a whopping 190 points to do something fun with. You could add Healing/Anatomy (I don't feel this is the best option). Resist (not a bad idea when playing a more casting based dexxer that may spend a lot of time in forms/on foot). Spellweaving (a strong option considering as I said you can't really gate Undead about, Conduit it ok but it's not better than Mana Shield/WOD/Attunement/Renewal/Summon Reaper which you will have space for on foot, plus Wraith Form+WOD+HML). Parry (if you go melee over ranged it's a good option). Anatomy/LJ just for damage obviously. Or you could even fit Music/Discord on there, Discord+ (Slayer instrument) Despair+Tribulation+Wraith Form+HML+Corpse Skin+100% fire/poison Double Strike. Lots of options, I just hope you do something fun with it, not just sampire.