I got my spring pack directly from Deaver paid $450 for the 4" lifted set. It rides nicer than the stock 3/4 ton springs but not as nice as SoCalHd's truck he got a 1/2 ton set and make ups the difference with the airbags for towing. It rides very nice. Also something Chris (SoCalHD) did was not waste his money of dual front shocks but rather installed a single SUPER PIMP DADDY bypass shock at each corner. It looks pimp and rides better than a $1000 hooker or so I've been told. I would agree with Chris, CST is the way to go. I have the RCD and have had to upgrade then upper A-arms and the steering(pitman and Idle arm) the CST comes with all the goodies already and the guys that did the work on Chris's truck did an outstanding job, some of the cleanest work I've seen.
Just my $.02,
Chris (the other one)