Well then. I need to read through the gestalt rules again, but no problem with that. Faerun is as good as any for me. But I on the other hand don't really like waterdeep nor the dales. A few ideas though:
-Calimshan. something with the thieves guilds maybe.
-Cormyr. If you would like to get in to some castle-building on the side of the adventuring, how about becoming the Baron of the Stonelands.
-The Border Kingdoms. Somewhat same as with Cormyr, but could also be just adventuring.
-Westgate. Gothic vampires, evil in the sewers etc. What's not to love. I have an idea for a bit horror story in this.