I've almost got the same party as you I've have:
Me - wizzard slayer
Anomen
Minsc
Jaheira
Aerie
Imoen
I like: Imoen because she has got strong spells.
Aerie because she has a LOT of spells.
Jaheira because...whell she is a not to bad fighter and she has spells like insect plage.
Minsc because I needed another fighter and I like him (Sarevok is stronger probably but...)
Anomen because he is strong with the crom fayer and the hamer that gives his neg plane protection and he has some good spells.
And then there's me:
Robin, I like me

,because of my magic resistance (now 97%, without neckless and sword 77%), my high hit points (about 165 hp), and my specialisation in long swords (max stars, 5),long bow (3 stars) and flails (3 stars).
But whatever group you take the game is always do'able, so my advice is that you take a group that you think is cool, not one of with is more powerfull. (I didn't take Sarevok in stead of Minsc but I think he is probably stronger. I kept Minsc because I think he is cool.)