I prefer to solo hunt, especially as an ap, which makes things like tactics less useful against a decent enemy (unless I bother getting wands with high level dispel magic, and I'm normally too lazy).

Similarly I don't really see sigil of pain as a major perk. Against foes where I need more damage, I tend to like to draw the fight out. e.g. against paladins, I want them to stick around longer so they take more iceballs/energy drains before I try to finish them.

Black circle... feels to me as if it shouldn't help much against a decent enemy.

Power of damned... only time I've ever had this work againt me it seemed pretty weak and pathetic.