Get a crown victoria and make it like a cop car.... 
I considered buying a retired Police Interceptor, as people would drive by the book near you. However, once they realize you're not a cop, you could create some serious road rage.
just remember if you buy it and something breaks on it it'll be twice as much to fix because it's a luxury saloon
Audis are known to last for a while before anything goes wrong. However, yes. In the event that something did break, it would be pricey. I would have about 1,000 set aside as an Emergency Fund.
You are getting a loving S-Class competitor. Holy stuff man buy it.
I more than likely will end up deciding on this. I'll be going for this anytime between January or February. So a few months for me to decide and get that emergency fund saved up :p