If I wanted a diesel, I'd have kept my Chevy. Solid truck. I don't need a diesel and lifted trucks suck where I live.
If you get a Ford, the 7.3 and the 6.7 are the only trucks worth a damn. With the 7.3 you'll have a tough time finding one that doesn't have a lot of miles or in good condition. The 6.7 you're going to pay top dollar for it. The 6.7 is still a somewhat new engine so I'm still not sold anyways.