Predator is right across the street from me. They have a good rep in regard to follow-up service and tweaks... but I think are on the high-side when it comes to cost.
Currently, they offer the Fabtech lift for the Av, but I'm sure you could get them to install an RCD if you wanted. I've heard they'll refer you to another shop if you want some of the lesser quality lifts installed.
I bought a Grand Cherokee lift from them and installed it myself. I did have them mount the rear trackbar relocation bracket though. I got some front-end shake after the lift and they diagnosed the problem for me.
Anyway, I've been pleased with the little bit of work I've had them do. Drop me a line when you decide. If you choose Predator, I'll walk over at lunch and check it out.