Unless your going to be ready to drop a lot of money Id avoid that gen of RX-7. They are great looking cars, but huge money pits. The NA isnt much to speak of, it will get you around but its no rocket. The TT is a nightmare. It has several major design flaws that need to be addressed, all centering around heat control. The radiator and intercooler are too small, and the cats are mounted underhood, adding to the heat problem of 2 turbos and the undersize heat exchangers.

Best thing to do with them is get one with a blown motor and swap a v8 into it.

Overall the Evo would be the best choice on your list.