6-10 grand to throw on a ZJ? Damn!!! I wish I had that kind of $$!!
If it was me, I'd first get a nice set of spare sensors, which are so PITA on the ZJ. Like, thermostat, CPS, TPS, MAP, coil, a spare fuel sending unit etc. That all should run in the well-less-than-$500 range and if I could afford it I'd always have it around- they won't go bad if just standing by as a replacement ready to be used.
Then, of course, lift w/ long arms, nice tires+wheels, steering upgrade, maybe a winch, some armor/bumper upgrade, swing spare tire carrier for ovesized tire you'll be having, maybe swap to 231 TC instead of 249 - or at least have a spare VC sitting around... That's what I'd do if I had money laying around - and I belive that all summed up is less than half of your budget...
Beauty is in the eye of the beer holder
* 1994 ZJ (by VIN) with a 1995 engine (PO knows why)