A 2" kit will level you out nicely and is the highest recommended for your truck. A 1.5" will leave you with a little rake. A 2" with a block in the back, such as the PRG's Mini Lift will also leave you with a little rake but take the whole truck up just a tad. Just depends on how you want it to look afterwards.
I have a 08 cc 4x4 and the PRG 1.5 inch leveling without any rear blocks. I am happy with it for the most part and it does make it look better. I got the bfg AT 275/70/18 a few months ago before i had the leveling kit and sort of wish i would have waited because now my tires look a little bit small now imo.