^ you are correct C7 and the C4 are on the low scale of quality. The difference is the C7 would be cheap to repair compared to the euro models.
So
1. BMW M135i coupe
2. Audi MK 3
3. CPO 2013 Cayman (doubtful)
http://www.audiblog.nl/wp-content/Afbeelding-14.jpg