for all that think the 6.0 is not a good engine, in the new diesel world there is a 700hp 6.0 featured. I think it got up to 107 in the 1/4 mile. I am sure it cost some $$ to get there, but no more than a chebby or dodge.
If the OP has no problems then he needs to really check what is going on. Get a scan gauge or something to see what your engine is doing. I spent less than $4000 for the work on mine to include studs, new BP egr, New OEM oil cooler and all the latest upgrades per the TSBs. Dont know if there are good shops where he is but find or ask if willing to travel to have truck worked on for recommendations. DON'T go to the guy in Georgia that is all over you tube. Knowledgeable folks have pointed out his many errors although he does a good sales job. The guy I use is a lead tech at a local ford dealer. Guarantees his work and is very reasonable. The 6.0 is a good engine overall, but like all there have been some problems more related to dealers and lack of knowledgeable techs to work on them. Also lazy owners seem to have caused many along with the performance guys who used and abused the engine and then went for warranty! I know dealers that installed AM performance parts and when a problem arose had to remove them for warranty repair approvals by ford, particularly if a engineer was coming to check the vehicle out!
Yes if you have $60-70k for a new truck go for it, but if willing to keep your present truck get it checked out and then make a decision based on the information presented as a result. Just remember nothing is ever certain, new trucks fail just as older ones do.