i got my leveling kit for 200 dollars off of stylintrucks.com and i installed it myself with a few buddies. it was pretty easy and im no car expert.
I have a readylift 2.25" leveling kit. I fit 325/60R18 (33x12.84) nitto terra grapplers but i had to alter the front inner finders a little bit to make em fit. i had to beat back the metal of the front inner fender so they woudnt rub anymore. if you dont want to do any atlerations on your own then i recommend goin down to a 305 or a 285. or you could always do a small bodylift but if you go to big on the lift then i dont think the tires fill out the wheel well enough. and i would rather just alter the fenders for free then dish out the cash for more lift.