I was in the same boat when i was lookng for an M3 (E46). Even after i purchased my car, I was still worried what will happen on my car. However, now i can say this with confident that the mileage is not the factor that we should be worried about. My 2006 M3 (smg) had 86k miles when i purchased it and now its got 95k in 6months but i haven't seen any small problems at all. I have been doing regular maintenance (including Inspection2 at 93k) though.
Don't worry too much!!