well dude, My friend told me there was a reason for Mazda to stop making the RX-7. well, there where two reasons, it was
1. Very Expensive
2. Overheating Problems
Mazda fully reconstructed the the RX-8 engine so it would not overheat.
That is just what I know, you might want to ask an RX-7 owner before you really consider buying one.
I dunno, my dream car was an RX-7 FD for the longest time until I heard about the problems the the engine had. Its true that last a long time but half the time, your gonna be pushing the engine (@ least thats what I would do . . . gotta love the rotary sound.
My suggestion to you would get a RX-8 and get it modified because they can be very promising. @ least you wont have to deal with engine failure.
Much Luck on your search.