I just started playing through Icewind Dale (II, but there's a I too, both are in BG's Infinity Engine, the difference is that II plays by 3rd edition rules, i.e. more or less the same as Neverwinter Nights' rules, while I is 2nd edition like BG). Pretty fun so far, and one of the main differences compared to BG II is that you're actually supposed to create your own party of six. Takes out the intra-party interactions which is a shame, but apparently you like it that way, so there you go.