Go 2011 onwards with performance pack.
Close to 500bhp in reality, they run the same forged engine as in the sls.
The 2011 onwards facelift has a slightly different auto box, which uses a wet clutch rather than a torque converter and the difference is marked.,
Response and gear shift times are greatly improved. Revised power steering too, better on fuel.
Pefornance pack comes with composite brakes too.
In a racing drivers hands the difference on track between an e.92 m3 is not much, in normal hands its a big gulf. Because they are more twitchy at high speed they can take a bit of confidence away, but if driven right they are an awesome car!
Servicing wise with somewhere like ourselves, it is very reasonable.
You will chew rear tyres if hooning.
It you want noise in the cabin, open a window slightly
Any questions just fire away. Not much goes wrong on them tbh,