Planescape - now there's a setting that's a lot of fun for higher level D&D characters. I always quite liked those appendicies in the Players Handbook about the Planes of Existence. Not a bad bit of syncretic mythology on Mr. Gygax's part.

I have played a fair bit of WoD in my time and the particular game your playing sounds very good. It sounds like a southern version of Deadlands.