I like the TJ's from 1997-2006(I have a 2001 and a 2002), they are a simpler to work on, and the inline 6 is very reliable, and long lasting. They are getting older now, so finding a good one is getting more difficult. Also avoid ones from areas where they use salt on the roads, it settles in low points in the frame, and rots them from the inside. I won't consider one from north of Tennessee.
The JKs started in 2007, the first few years with a 3.8 liter engine are reliable, and cheap, but that motor was straight from a minivan, and is pretty gutless. But if just to tool around with the top down, might be a decent choice for the price. The 3.6 liter started in like 2012, and is better suited to the jeep, but you will see a price jump with those.
2022 Ford F-350 7.3l
2002 Chevy Silverado 1500HD 6.0l 268k miles (retired)
2016 Heritage Glen 29BH
2003 Flagstaff 228D Pop Up