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I've got the 7.3l Ex, 2003 model. Researched the engines at length, and had a '99 F250 with the 7.3 liter, so am familiar with them.
The 6.0 are notorious for having major problems, especially the 2003-2004.5 models. Buying a used one, unless you bet your pocketbook on the person selling, is a crap shoot.
If, and this is a big if, I were to get a 6.0, I would put aside $5-6000 to get the head bolts/studs/gasket replaced, go through the emissions package, and take care of various add-ons to increase the reliability. Theoretically, the 6.0 IS a 'better' engine, if you only look at torque and Hp. BUT...
There is a reason Ford got sued over this engine...
Now, there are those who will raise Cain about their 6.0 running a zillion miles with no problems, and bless them for that, but just visit the 6.0 forum for a while before you decide...
My advice? Get the 7.3l unless you have extra disposable income.