PreKey mod (07 and older keys on an 08+)will get you about 1.75" lift with the stock depth/crank of the bolts. Best and cheapest route is getting a set from another member or hitting up a junkyard.
Dump the stock block, and get the AAL and shackles. If you do those ontop of having a block, you'd be about an inch lower than me....you'll gain 3" in the back....but wont gain 3" in the front. If you did the shackle and AAL w/o the stock block, you'd gain about 2" in the rear.
All your PreKey info is found here, including part numbers....
Belltech 6400 2" chevy drop shackles(which are adjustable so you can perfect the stance)
ProComp Short AAL