[Debaser]

If you really really enjoyed the BG series, i'm almost positive that you'll have some fun with icewind dale. don't expect the same depth of plot and any kind of NPC interaction, but its still a kickass game in its own right and any BG-loving person can appreciate it in some capacity.
also, if you're looking for something a little less free-form, but with a hundred times the plot development and role-playing (in the true sense of the word), try planescape:torment.