It has been over 10 years since I've last felt this - you finish a game, and you want to start over immediately.
Meanwhile, any recommendations for an IWD2 party composition?
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First off, be warned that it is a COMPLETELY different system altogether.
I just had that with Blackguards. I completed Blackguards and immediately wanted to go again, but there was Blackguards 2 to consider. So I started 2 and, oh my, it's a completely different game. Still liking it, but its not what I got from the first one.
For IDW2, my go-to party would be 2 fighters (one human paladin, one Dwarf fighter, can't remember which variety of each though), two clerics (ones with identify and one with haste), Ranger (arrows) and a rogue (can't remember which variety). Though you'll probably want an arcane class just because that's what people do in these games, to which I guess the rouge would be the drop-out if that's the case. IMO, of course.
Edit: not sure I'd recommend dualing clerics, they come into their own mostly in the very high tiers of their spells, like spell level 8+