I used to teach @ Y47 from May 04' to Oct 05' I got out during a good time. Although the winter I had bi-weekly paychecks of around $300(so $600/mo) because the Wx was typical Midwest crap. I had appx 12 students, about 6-8 fairly active ones as an example. I knew guys at Metetal and Pontiac and they were about the same situation.
So if you are looking to be in a steady financial situation, Houston will probably offer that a slight bit more. If you are from the DTW area and looking to stay local, but sacrifice some financial stability, then stay there. In the end, it's what you want to do. Good luck