Everyone says that the 6.0 powerstroke diesels all have issues with headgaskets.  Well neither of the powerstrokes that I or my father have owned have had issues.  These idiots don't do custom tuning on these beasts and run too much boost with the stock headbolts and end up lifting the heads.  If you want to program a 6.0 get some custom tuning!!! http://www.spartandieseltech.com/ .  Anyways, stock it's got awesome power, and can tow circles around other pickups.  It also can hold it's ground with some stoplight to stoplight racing.