If you're going to just level to fit bigger tires, most people recommend Bilstein adjustable shocks and an optional spacer in the back. If you want a full suspension lift, BDS seems like one of the top brands around here. However, I've seen a lot of trucks on here running Rough Country lifts without any problems. In fact, there's a sticky just for Rough Country lifts: http://www.ramforumz.com/showthread.php?t=131830
. Do a search on the forum for any of these and you'll find countless discussions both for and against.