I'd suggest sticking with him, for what my two cents are worth. If you want the very best party, you'll never decide on whom to take; because it all depends on what you like in a wide range of areas, not to mention your playing style and the way different professions deal with differing situations.
Some party NPCs are definitely "challenged," but that can be fun, too, if you want to see how you can minimize their disadvantages and maximize what they've got. I've tried all the NPCs, now (except Mazzy, whom I've repeatedly forgot), and can't say any of 'em were bad in a reasonably varied party.
As to Anomen, he's a good priest and a fine fighter,if not quite the storehouse of spells that Viconia is. I tend to prefer Vi, but she doesn't get along well with good/neutral parties (unless you use the Baldurdash file to disable alignment reactions, and I don't). Don't worry, he'll grow on you as he advances, and particularly after you add-on ToB.
