I am trying to finalize my specs so that I can start pricing a new Sport Unltd. Has anyone here replaced the driver's seat to get better lumbar support? If you buy the "premium sound and leather" option, that gives you leather seats that are heated, is it the same seat, just different material, or is the seat more supportive? If I want a different seat, do I have to do this aftermarket, or can I order something different from Jeep? I'll be getting one made to order since I think the exact specs I want won't be available off the lot. Thanks!