Is your car paid off? If so, Continue making car "payments" into a separate account for a year. Use this + G37 trade in as a down payment on the M2.

I typically steer clear of advising to go with German due to my family's experience with them but my God does that car look good.

 

This is a fairly common question more or less, everyone seems to get a BMW or move to a domestic coupe of some kind. I still don't think you'll find something as reliable and exciting all around for the price range you're in. If it were me, I'd just trade your lemon for a newer 2013 G37 S coupe or IPL. Easily in your price range and leaps and bounds more reliable than anything from Germany.

 

Correct^ I wouldn't settle for an older German model in that price range.