off the shelf lift kit is tuff country / bds / sky jacker soft ride . 1st 2 being a toss up and bds prob a hair better .
if you have a big block or huge winch bumper or snow plow go tuff country HD option for less sag they still ride great tho . i run 3" hd front cause of my fisher snow plow .
bilstien is the hot ticket right now for ride quality of shocks .
if you want a 1 stop shop and done call these guys up . they have been specializing in leaf spring gm trucks for YEARS now .
www.offroaddesign.com . they do tuff country or custom built leaf packs . they do bilstien shocks also as a upgrade . and have lots of other specific goody's to beef up these trucks .
i have both tuff country in 3" hd front and bds 8" front and 4" rear . so i am not just making random suggestions . my friends k30 we took out rough country and swapped in tuff country and he said he should have done that years ago it rode so much better . if i am doing new rear at stock height i like triangle spring brand and do 22-547 56" rears on my k30's to ride nice and still work good . then if i am working it i have timbrens on 1 and firestone air bags on the other .