I have an '07 Unlimited X and my goal is to build a Rubi on the cheap. Since a lot of the guys who will pony up the extra bucks for a Rubi then proceed to mod the living daylights out of it anyway, there are many lightly used Rubi parts available on Craigs List, Ebay, etc. So far, I have gotten wheels, tow hooks, and fog lights. I have a buddy who's going to give me his lockers as soon as he upgrades to OX lockers (don't know yet if they will work in my axles). And I have a line on a set of rockrails that are fairly inexpensive. I've even seen Rubi T-cases used.
either way you decide to go, you're gonna love the JK.