As a quick addendum, I do run cetane enhancer (Ford's), Archoil additive, and Howe's anti-gel in the winter. I have used and still use occasionally Optilube instead, but the winter version does not handle the Idaho cold. Several posters have stated that 6.0's need oil and fuel additives and I agree. In fact, I would recommend them to any diesel owner.
DIY oil changes run me about $80-100 with full synthetic. Fuel filters are expensive and should be replaced based on mileage and fuel quality. If you gel in winter, replace them. Be sure to catch Diesel Tech Ron's online videos, may he RIP. He was a tremendous asset to the Ford diesel community.
My work in the transportation department allows me to drive lots of different trucks, especially pickups. I see lots of good things about the different makes, and lots of things I don't like, but I cannot say with any conviction that one manufacturer is head and shoulders above the others. Emotional brand loyalty colors much of the discussion on the internet, so take what people say with a good deal of skepticism. Nikon vs. Canon, Lance vs. Arctic Fox, there is something out there for everyone to bash.
A Ford is what I own so I feel like I can comment on how it has treated me. Everyone around here in ranch country is partial to Dodge -- back in Virginia they were Ford lovers. Where I work they like the Duramaxes. I just like trucks! : )