BG2 is great - I love seeing all these posts! I have bought IWD2 and can't be bothered to end chapter 1! Same with so many other games I have spent good money on in the last 2 years and simply shelved. But, I keep 2-3 games running in BG2 with 2 copies on my computer - one moded and one not. It simply rocks.
I am afraid, however, that with this game there is simply not going to be another like it. It happened at a unique moment in time. I doubt a 2E based D&D game will ever be made again, first off. Second, the Bioware / Black Isle fallout.