Do you know what axle ratio you have? If it's 3.21, you should probably look at 33" tires. Keep in mind you will need wheels with the proper back spacing to run bigger tires. If you are just lifting for looks and 33's, the budget boosts do a great job at that. The AEV 2" is a great place to start.
Read this: http://www.wranglerforum.com/f202/beginners-guide-to-lifting-your-jk-298665.html