FWIW, I am lucky as I have a choice of DD's, Mazda RX8 and Chevy 2500 Duramax diesel. The chevy gets better mileage 20+ around town, 17+ towing with a hypertech. Not as nimble as the 8 but better fuel mileage and is pretty easy to manuver around town. No worse than the 'Suburban I replaced. BTW the 'Burb got a whopping 14 mpg on the highway and around 7-9 towing, even with an aluminum trailer.

I think you will find a diesel truck to be pretty nice for a daily driver and you can get a pretty good return on your money when you get ready to sell it especially if you buy used to start with.