Well, you might be able to find a high mileage yj for that price, if you need something that runs. But if there is any way you can get into a tj, they are a much better vehicle. The coil spring suspension not only provides a much softer ride, but also allows the axles to much better articulate on rough terrain. When you get one wheel off the ground, which is easy to do with the old leaf spring suspension, that wheel is the one that gets power on a standard or "open" differential and so it just hangs there and spins. The tj's coil suspension makes it much harder to do this. Also, i've had a lot of trouble with ax5 & ax-15 transmissions, and dont even ask me about the horrible puegeot thing. My 89 yj had that awful plastic throwout assembly inside the bell housing, which makes major disassembly nesessary when the slave cylinder goes out, which it certainly will. Yj's also did not have fuel injection until '93 i think, and the feedback carburetor had to fooled with all the time as i recall. I loved that '89 yj, but i had to work on it all the time.
tj's are much more reliable, imho.
Cj's are very cool, of course. But now your getting into very old rigs that may need constant care and many times the gearing is so low that it's just not a practical vehicle for freeway speeds. good luck, john