Question from an M3 owner
Changing cars you always lose money so I'd hold on to what you have. However, if you're set on changing the C32 is a great place to go. Make sure the IC pump has been changed and it is a CPO with only one previous owner. That way you know it has been looked after properly.
Oh yeah, if I lived on the east coast I'd go with awd for sure. S4?
Don't worry too much about the Intercooler pump. Yes they do go out but they are a cheap easy fix (as long as you don't go to the dealer).
Make sure you get a repair history on the car - take the VIN to the dealer. That will give you an idea of the reliability of the individual car you have. Also make sure you check carfax.
Stay away from HIGH mileage, IMHO. Common problems, heated seats don't work, IC pump failure, about $100.00 DYI, Some have sqeaky bushings, although I haven't seen this issue.
The radiators, valeo if I remeber right, leaked anti-freeze into the tranny cooler. This would wipe out the tranny PDQ. Again, just check the MB maintance sheet. If you can't get one for the car, WALK AWAY!
See yeah

PS: I too came over from the M side, you are going to LOVE the low end torque






