RUST, check the spare tire well, the rear shock towers where they meet the trunk floor, floorboards, and front strut towers just above the framerails. Texas cars shouldn't be nearly as bad as they are here in the midwest.
Coupes are usually easier to find. Hatches cost a fortune (initial d tax). Spend some time looking and find a clean low mileage GTS, you will be glad you did.
Check out this article from dorikaze.ca, and check out some of their other articles while you are at it, very informative.
http://www.dorikaze.ca/dorikaze_primer.php