Well, if this is the first time you finished TOB, you could... well, I don´t know, try completing it again with another class, gender, alignment or something.
Beyond that... Hmm...
I´d say:
Kotor 1+2
Fallout 1+2 and Tactics, I guess.
Icewind Dale 1+2
Planescape: Torment
And as a sidenote on other games in the CRPG-genre: I never liked Neverwinter Nights. I completed it ONCE, and since that, I´ve never really played it. The story isn´t exactly thrilling, and the NPC interaction, both with the PC and other NPC´s, was horrible. And don´t even get me started on how much I loathe that radial menu system.
If you want an interesting party with a lot of backtalk and sometimes moronic and hilarious interactions, Baldur´s Gate 2 was a classic. Planescape and Kotor are as ingenious as that in many ways. The NPC´s aren´t just minions as in Diablo 2, I´ll tell you that.
Sadly, they don´t make many games like that anymore.