There is some good stuff in this thread. I've also been debating between diesel and gas myself for my next truck.
I decided to see about a gasser because this truck will be my daily driver. I also looked at the places that diesel is sold, and it would mean a pretty long wait to fuel up when needing to get to work (usually one pump at most), while finding a gas stall isn't too much of a headache. In stop and go Austin traffic which will be where the truck spends morning/afternoon commutes, engine size isn't as big an issue.
However, if this truck were just for the TC, I'd be thinking about the purchase completely differently, just because turbo diesels lose very little horsepower when climbing in the mountains.