if its your first jeep and you are not that familiar with jeeps.
just go to the car lots, craigslist, etc: drive a few used jeeps, at least 3 before you lay any money on the table,
before you settle, look for loose wires and rust, these are signs of problems to come.
most old cj's will have plenty of those!!!!!!!!! be sure to drive it on a rough, bumpy road, as cj's will and can have very loose steering issues.
cj5, cj7 however, do not drive the models made after 1999 as they drive and ride like a car.
I have the 4 banger in a 1984 model cj7, runs ok, but not a power house.
if you are a big boy like me, the cj7 is much easier to get into, out of: just me.
however the cj5's do look good.
its your jeep and you will be the one riding in it, fixing it and driving it, so no matter what anyone says about any model jeep, you make the decision.