You might want to ba a Mage or a Sorcerer to get the real magical power in the game, you dont have Imoen down for definate and later in the game magic is the most important thing especially in ToB, you might bring Edwin along instead but you need a high powered mage.
You are going to need anohter tank so a good choice for a fighter is monk, thats an understatement and Im sure there are a lot of people on the board who will testify to this so you might want to check it out. A paladin is a nice easy boring choice so dont try it, why not check out a barbarian for kicks, they rock, excellent choice very much something everyone should check out if they can.
You have 3 definates so I get to suggest 2 charecters, if you pick a fighter bring Edwin, if you take a mage bring Korgan or Keldorn along. For the last choice Id just say take Edwin along anyway because hes my favorite charecter, aside from that try Mazzy for back up.
I suppose I really pushed the mage thing but in ToB it is soo important
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jabidas = Sorcerer of clan Aerie thing
Also I will have nothing to do with sulpher powder and secret priesthoods so dont even try it.
And dont worry soon you shall all be part of my ever growing army of the undead.