Ok, I'll play... So you have 37's and a 4.5 long arm right? Pull the long arm and wheels off send it back to stock config and put the long arms and wheels on the new one. I'm sure you still have the pull off parts, just put em back on and wahlah you've got your lift and wheels for the new JKR. As long as its a 2 door you have a complete lift kit. May require an investment of a few hundred bucks in replacing the stock control arm mounts but thats still cheaper than buying a new lift for the new jeep.
Considering the resale value of used jeeps you shouldn't be too bad financially but you're still going to take a hit for a few grand. Now considering that 2-3-4 grand hit consider all the mods you could do for say 3 grand. Lets just look at the "upgrade mods" to get to Rubi level. The only real upgrades in a rubi is the transfer case, lockers and front D44. If you're going to take a 2k hit -theres your pro rock 44, 3k hit- theres your Pro Rock 44 and half of your ARB lockers, 4k- Pro rock 44 and ARB lockers. Now the only thing left would be the Atlas transfer case at 3k and you've got a better than stock Rubi with 37's and long arm that you already own. And it's a Gecko... although there aren't any good rhymes that go with Gecko it's still one of the coolest colors ever available on a Jeep. :twocents::twocents: