Jodyblip is right, the shop is going to hit your for 1000$ in labor, that's 10 hours at shop rate which is about double what it should take a competent shop to do it...they're gouging the crap out of you.
For that price, you'd might as well have the dealer install it. Most dealers will maintain your full warranty if they install the product. (If they say they do, get it in writing.....if they don't, find another dealer)
The lift is fairly easy to install with a friend, a little patience, and a nice saturday. (and Air tools, though not a must, are a definite plus)
Rubicon Express had a nasty spot a while back, but seems to be doing better. They're not the only game in town though. See what your dealers' preference is. Or if you're going to go the DIY route, you have MANY fine options. The parts that you void warranty on with a lift, you replaced anyway. Larger tires are a different story... That all depends on how mod friendly the dealer is.
Lifts over 2.5" get expensive really fast beyond the cost of the lift, but you'll never have had so much fun emptying your bank account before!
You would be amazed at how competent your JK is with stock 255's on it and no mods though.... 285's on stock suspension will not rub and look AWESOME.
Make a man a fire and you keep him warm for a day....Set a man on fire and you keep him warm for the rest of his life....