Tire and Wheel size is personal preference. Just search google for forums with the wheel/tire combo you are looking to go to and you will see tons of pictures to compare. Personally I went with 35s on 17" rims and a 3" lift and it looks great on my 2 door JKU. I made my decision after scouring jeep forums for hours to get the best combination of aesthetics and off-road performance without having to make a ridiculous amount of modifications. Generally, once you go past a 35 inch tire to say a 37, you need to get some extra work done under the hood/undercarriage to make it work.