Camaro SS V8 / CLS 63 AMG / S6 / A8

Hello all, I’m looking for a 2nd vehicle with more steam. I stand between the following vehicles: 1. Chevrolet Camaro SS V8 407 PS Bj ca. 2010-2015 2. Mercedes CLS 63 AMG 514 PS Bj 2008 3. Audi S6 5.2 FSI 435 PS Bj 2008 4. Audi A8 4.2 FSI 371 PS Bj 2010 My budget is about 25,000€. Important for me would be that the car remains value constant. Driving time of the car about 3 years… Driving performance is about 5,000km / year With the AMG and the Camaro I don’t know myself so much about I’ve heard a lot of negatives about the Audi S6 and the A8 because of the FSI engines. Can you help me decide? Which engine do I have least problems with? Which car loses least value? Would I be happy to receive answers!