Well, we've got a melee brute/tank, a conjurer GOD wizard, and a fifth-wheel (me). I can fill most any niche, though not quite as well now as I can later. You can pretty much play anything you think would be fun. Then again, I'm not entirely sure what we'll be going up against, exactly. I'm also the only one who made an official vote on the location, so I suppose there's some room available.
Sometimes if I'm looking for ideas on a character I look at what people are putting together over on the Min/Max forum, or I'll just look through random books and see if there's anything I haven't tried putting together yet.