Interesting. To update this thread since it's here, I ended up going with the Bilstein 7100 12" short body in the front with 275/78 valving and the 10" 5150's in the rear with 255/70 valving. The front springs are 8" Skyjacker with one coil removed (which are pretty stiff) and the Prothane poly coil inserts for bumpstops. Rear springs are mostly 1/2 Chevy with an MJ main leaf, 5" longer than stock XJ, with liners, and poly bumpstops.
It's not perfect in the fast stuff, but it's pretty good. And not a very expensive setup.