As someone who made the mistake of owning a 6.0, I'd strongly suggest not buying one. If you want a Ford diesel, go 7.3. The 6.0 we had, in the course of 6 months racked up well over 8 grand in repair bills, it was a nightmare. We replaced every injector, turbo, ac compressor, ficm module, on and on. The 7.3 we have now (have had for several years) has only needed regular maintenance.
Life is like a camera. Focus on what's important, Capture the good times, Develop from the negatives and if things don't work out, Take another shot.