I agree, the 5100's and RE springs ride plenty good for me. Keep in mind its a damn Jeep, no matter how fancy Chrysler tries to make it for the yuppies and retirees. If you think the 5100's ride rough go hop into a stock CJ-7 and tell me you still think your JK is too harsh for the road.
I also want to run those TWF recentered HMMWV wheels with either some Iroks or the BFG Baja T/A's. I'm really concerned about the weight though. Also, it seems like if you want to upgrade the brakes at all on these things you need to be running 17's at a minimum.
2.5" lift with bumpstop extension? All you need is flat fenders or trimmed fenders and the 37's will fit.
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2008 Unlimited Rubicon: 37's, 3" Synergy Springs, Artec trusses, 5.38's, Winch, PSC/Poly Cage, Bumpers, TNT Alum belly skids, and other doodads