What do you think, is 172,000 miles too much for you on an M3? The seller and 3rd owner makes it sound pretty good. It has a respray and a new hood and fender. It is kind of hard to tell how good of a paint job or repair this is without seeing the car in person.
The seller does mention the dreaded rust word, but says it is a very minor sport caused by an improper windshield replacement. The current windshield also needs replacement because of a crack.
Looks like it is going to need some work to spruce it up, but if it can be had cheap enough there may be room to make the needed repairs. As is, put some new tires on it and see how far it drives.
Buy-it-now is $13,800.