That's a great idea, that's why I'm planning to keep my Miata after college. I used to commute long distance on my Q45T V8, the cruiser car was quiet and comfy, but it became pricey when I started going to school. I used to have the same exact car that you just bought. Use Meguiars light cut cleaner on the car with a buffer to bring out the paint, it did the job for me. I would try to sand out that small rust you mentioned though, you might have a pinched rocker drain.