I have the Fabtech Performance 6" lift, and I absolutely love it! My buddy and I installed it and I was very impressed with the quality and fit of everything. It really made the OEM parts seem like toy parts. The ride quality is just as good as if not better than stock. I took a road trip this past weekend and cruised 75-85 with ease, and at one point I got on it a little to get around some slower traffic and I looked down and was like oh **** I'm hitting 100. It was smooth as hell, had no idea I was going that fast. I can't really speak about the other lift kits out there as I don't have any of them. I did quite a bit of research before I bought the Fabtech kit, as I spent quite a bit of money on the truck and was very happy with the truck and wanted to make sure I got a good lift kit and remained happy with the truck. I have no regrets about getting the Fabtech kit, I feel it was worth every penny. BTW
Nick@GotExhaust got me the best price of the Fabrtech lift if you decide to go that route.