Excellent job! Well done.
Now you've completed the game with no reloads with a powerful and versitile class, how about trying it with a single class? You pick...
Alson, BG1 is not a patch on BG2, but it's still very good, and will keep you busy for ages. I've just rolled a very good cleric/mage that I'm planning on taking right through BG1, ToTSC, SoA and ToB (with mods). Should be very powerful indeed by the end. I've worked out that he will have a natural WIS of 24 by the end of the game!
Have you tried the Icewind Dale series?