I lived in Dallas for several years, and was actually back last week talking about a job change.
Cost of living is fairly low compared to other large cities in the US. Gas seems to be average or below. The nice thing I like about the DFW area is the road/highway plan. They actually think about it! So many big cities I've lived in or delt with have terrible road ways. Sure there will be traffic during rush out, but it's not the kind that makes you want to get out and hang yourself.
As for animal laws, they are tight about things that could be problematic for them (FW rays, large aggressive FW fish, etc...)
Study of Alligator gar is very specific for a career. I'd suggest going a little more broad range with what you are hoping to do. Are you hoping for a State/gov't job or something else?