bastard pack it with a BroncoII pack. Swap the entire pack under the XJ main leaf and you should be looking at 3.5" of lift. Really comfortable on road/off-road ride and they seem to flex well too. And cheap, since I'm cheap this is a big deal!
Failing that, I always hear great things about OME and if I had the cash, I'd fork it over right away just so I could give it a try!