What's the best used performance car for £30,000?

I’m asking this question as I’m looking for a new car and I just cannot decide on what car to get.
My head’s telling me to get an 8V Audi S3 or an A45 AMG. On the other hand my heart is telling me to get something like a 997 911 C2s or be even more stupid and spend a bit more any buy a high mileage F82 M4 which is the dream.
However right now I’m considering getting a BMW 435D, specifically an Autovogue 435D. The best of both worlds right?

This is the Autovogue 435d
This is the Autovogue 435d

Anyway thanks for reading this and I will really like to know what you would pick!