Welcome to IW!!! [img]graemlins/thewave.gif[/img]
You'll definately want Minsc for his comments. If you install Unfinished Business, then you'll like Minsc even more
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Keldor is a great Paladin as well. He's an awesome tank, but if you're going to be an inquisitor, you may want to take Anomen instead of him. Anomen can get pretty annoying, but he's a good fighter and decent healer.
Aerie is a great cleric/mage, but she tends to die a lot early on with her low HP.
You should take Yoshimo for your thief. He's the only character that is a single-classed thief.
Jan can also take up the role of thief instead of Yoshimo, as well as being a good illusionist. You'll want Yoshimo over him in the beginning, however. Or you can take both of them together.