You won't be getting a Hemi for 6-7k. A used one if most likely twice that price. If you get a WJ (99-04), keep about $500-1000 of that for servicing it. When I got mine a few months ago I replaced all the fluids, valve cover gasket, oil pan gasket, rear main seal, end links, shocks, etc. The $7k range would get you a slightly newer GC around here, probably 2005-2007.
FWIW, m 2004 has 174,000 miles and runs like a champ and is in excellent condition. I got her for about $5.1k