I wouldnt recommend a only PC party... im playing one currently (ranger dualed to cleric from start, elven swashbuckler, half orc barbarian, and half-elf conjurer), and lately im not having much fun... no interaction at all, and i chop anything to pieces into seconds, and if its too hard, just time stop and improved alacrity and cast almost every spell.
Im thinking on starting a new party (an evil one as ive never finished the game evil) consisting on two PCs (kensai dualed to mage and some kind of thief, probably an assasin or a kensai dualed to thief) and the evil chars: Vic, Korgan and Edwin. That leaves 1 slot (that will allow *that* NPC you meet on ToB to join), during SoA ill probably bring Yoshi or Jan, dunno. I hope ill have more fun with this (once i had Vic and Korgan together for some time and it looked like they have some nice dialogues).
Anyway i wont stop playing the only PC party... i hope ill finally play all ToB through... ive had it for months already