Depends on your budget:
over 100k
1. Porsche Carrara 4s or turbo
2. used Ferrari 360 or F430
3. Aston martin vantage
4. BMW M6
5. MB S63 AMG
between 60k to 100k
1. BMW M3 convertible
Between 30k -60k
1. BMW 335 i
2. Infiniti G37s conv
3. Porsche Boxer s
4. MB E350