Mazda MX-5 is fun and cool.
2007 Mazda MX-5 Miata SV
I bought my car used, but have never had a problem with reliability. No major problems at all. Automatic convertible top is very convenient and reliable. It is somewhat loud from all the road noise, but that's common with convertibles and it's much better with the hard top. Only other complaint is the air conditioning is not working well, but does continue to blow air. Only seems to cool the air while moving.