Let me summarize the advice given so far:
You should buy a used aircraft. No, wait, only buy a new aircraft. But on the other hand, maybe a used aircraft is a good bet.
Some people turn a profit on leasebacks. But then again, some people lose a lot of money. Oh, and some people break even, too.
Possible models to consider would be the 152, 172, DA-20, DA-40, Bonanza, PA-28, 182, Remos LSA, TBM850, J-3 cub, or military surplus F-14 (if there is a demand for high performance fighter jet training in your area...do some market research to find out).
It will probably help out financially at tax time. Or maybe not. It all depends. Actually, we don't really know.
Haha...ok, seriously now. I love JetCareers, but this thread is a classic example of why I rarely ask for advice here anymore, at least for decisions like this. There are simply too many possibilities. Too many factors to consider *for your personal situation.*
My advice? Treat it like a new business idea. Go out and talk to whoever might have a financial stake in the plane (the FBOs, mechanics, etc.). Find out what they say. Run the numbers. Run the numbers again. Do a lot of research. Talk to your accountant. Do research. Do some more research again. Then make your decision.
Good luck!