got the one with the knuckles
http://www.roughcountry.com/gm-suspension-lift-kit-247-8.html
i did use their rear shocks (for now) 2.2 option (not crazy about them, but OK). had had someone else install (shop) for $300 (i guess because it was part of a package including wheels, tires, flares, etc.)
So far, i have been giving them a run for the money.
i live on a farm (no asphalt) and work for a large farming company (always on the field), so i do take advantage of the extra clearance and traction every day. i have 3.08 gears so that's next
Didn't go higher because, like i said, i am short (5'.5") and not looking forward to ungraceful dismounts in front of my crew