If you are worried about the warranty (as I was), why don't you go with 5 Star?
5 Star offers a warranty package. 5 years/60,000 miles is $500 and 6 years/100,000 miles is $1,000. I went with the 5/60 since I can't imagine the 6/100 being worth it for double the price.
Reading up on the F150 forums, the few that had to use 5 Star's warranty were very happy with the service.