The used car market is a lot more regional than people realize,
Automakers have been subsidizing the lower end of the markets to meet CAFE standards.
The huge growth in large SUVs is essentially over. At the same time there is going to be a very significant market for large SUVs like the Chevy Tahoe. There are just too many people who need what a large SUV does for them.
The car market is extremely competitive. There are a lot of brands vying for your attention and if you do a reasonable amount of shopping and negotiating, you should be able to get a decent deal yourself.