Well, lots of folks sell their stockers, or if you want you can keep them and put them back on when you get rid of the Jeep, and then either reuse or sell you aftermarket.
Look at some of the picture threads and decide what it is you want first, then determine what size you want. Keep in mind how you plan on using the Jeep and what sacrifices you are willing to make to accomodate your desires. First you need to decide what you want as far as tire size and usage. That will determine the need to lift and the wheel particulars you will have to consider.