I daily drive a 2005 F250 4x4 with 6.0 PSD, but I have a 2wd 1999 F250 7.3 m/t at home as a backup. Its quite handy to have two.
I can honestly say one thing that is contrary to most internet rumors. The 6.0 has been a great truck to me. Hauls anything, has abundant power after some "tweaks", and is the most comfortable vehicle to drive long distances that I've ever owned. And I've owned a lot of vehicles, including a Tacoma and Tundra. The 6.0 can be very expensive to own if you don't do your own maintenance/repairs, and things do break. However, the repairs are mostly predictable. EGR coolers and oil coolers fail, though the EGR cooler is easily eliminated.

If these fail and are ignored, head gaskets are next in line. Injectors get sticky, and need replacement, especially if oil changes are delayed. All it takes is some preventative mods and regular maintenance and they are good engines. The 7.3 with the stick is also a stellar truck, and it has never failed me. They are legendary engines for good reason, very simple and very reliable. It also will return nearly 20 mpg on the highway without trouble. Try that with a new diesel truck. I plan to keep it as long as I feasibly can. Great truck. Which would I choose if there was an apocalypse? The 7.3 of course. However, Ford buyers will have to get used to the newer crop of "smog diesels" and their shitty fuel consumption for the time being, as people are petrified of buying the 6.0, the 6.4 PSD is even worse, and the newest 7.3 is now 10 years old.
This picture says a lot:
I want to test drive a new 6.7 PSD, but am afraid I would like it too much. That can wait until I wear the current one out.