I sought out to purchase a roadster style car this June and must have tested everything under the sun. I wanted to stay $60k and under which actually didn't leave me with many comparable options. My favorite cars ended up being the Corvette, M Roadster, and 350Z Roadster. Once you sit in an M roadster, you will notice the marked difference in quality. The M has it all, style, quality, and great feel.
The engine will put you through the seat. The handling allowed me to keep pace with faster cars through the hills nearby. It feels well made, everything works together, easily converts into a daily driver. Open air, it's a convertible!
Convert the supercharger from the M3 to fit this car ASAP. Can never go wrong with more power.