Rich your so right, but i got to say its an amazing car, only just getting to feel just how sorted it is.
It certaily keeps you on your toes, actually shows how my scoobs 4 wheel drive is so good especially in the wet.
If its raining then the M3 might as well be a 318i

As for tyres.
Continentals £250 each
Mich pilot sports £290 each
P Zeros £300 each
Toyos and yoki's £300 plus

The rears on an M3 are only good for 7 to 9k max. Big Ouch