Here's a hint no one touched on....how to buy. Check out some deals when you figure out what you're looking for, and take a jeeper along with you to check it out. Sometimes it is the simplest things that others notice with a little more experience. As for prices:
JK's - newest and most expensive 2 door and 4 door versions
TJ's - coming down in prices
YJ's - dirt cheap deals right now
CJ's - not as cheap, as they are either needing lots of work ($$$) or they are already built (more $$$)
XJ's - even cheaper deals for good rigs
ZJ's - original Grand Cherokees....can find some nice ones with leather interior, etc, but more cost to building them
Leaf springs or coil springs? Something to think about. Availability of parts? What do you want to do with it, and what can you AFFORD to do with it? (two DIFFERENT things)
And as stated above, you have already done a lot more that a lot of four wheelers out there did in the beginning....you asked for help and info. Best thing you could have done, and as simple as it seems, not something that happens as regular as it should.
Darcy