Thanks for the help!
Gregor, the thing with Isthithia vs. Kossuth sounds interesting. I've always liked the idea of using the basic elements as different "sides", like good versus evil. Fire is a good representative of evil, but it could as well be neutral. Anyway, I'll see how I can integrate this with the other idea. However, I think I'll stick with having Bane as the evil god. The element thingy will come later.
I guess the opponent of Bane could be of any alignment, due to the fact that he's got dominion in his portfolio, and he doesn't favour evil over good (theoretically, that is; practically I guess he tends to ally with evil rather than good if he had to choose). However, I guess the opponent will be of good alignment (or any non-evil) since the PCs are good.
Again, thanks for the help!