30's with stock flares and stock wheels. 31's with stock wheels, trimming of flares, and some steering stop adjustment.... 32's with aftermarket (less backspacing) wheels and lots of fender hacking.
I'm running 32" swampers on my 2" lift right now... the short add-a-leaf sucks but the rest of the lift is worth the money for sure. Get the full length add-a-leaf, it might cost you a bit more but your stock leaves will thank you (IE, they won't turn into an S-shape like mine with the short add-a-leaf).