I have no experience in doing it myself, but I have a friend who runs this:
120 myst
120 focus
120 swords
120 tactics
Then I believe that his other skills are spellweaving and meditation, which is swears is incredible (and I believe him, because he's very good at what he does), but I wouldn't want to try it myself since healing is only good intermittently and everything he casts defensively has a recharge timer.
So if I were to try it myself, I would use 120 swords, mysticism, focus and 100 healing, anatomy, tactics and less chivalry (65-75). Since you'll have the colossus, parry would be defensive skills you'll never use (then again, the same might be said about healing, but it's just the template I'd start with before tweaking)