M roadster/coupes have very few engine reliability problems, and besides the rear-subframe (Which is terrible) They have very few structural problems.

Do NOT cheap out though. The Z3 was simply not as well put together as the M roadster/coupe and does not handle abuse well. Maintenance is a must with either, or else you end up with an engine that sounds like a beaten dog. Fabulous cars.

Kyle: Keep the dub. Skip the NSX. Buy a 964/993 Turbo.