Usually I think of Mercedes as a bit stuffy and boring, but the lunacy that the c63 brings to the table is really a smile factory
(Sorry, just had to say it)
Anyway, I also love Audis but they definitely don't hold their resale value as long. My local Audi dealer is the "Number 1 Audi Dealership" in the nation, and they also tried to tell/sell me that they are better than BMW in resale. Horsesh*t