C63 is useless in winter. Plus, AMG cars depreciate like no other car on the market. But, if you must have a Benz, and need it for the winter, then take a look at the awd C43. It was introduced as the C450 AMG Sport in '16, but for marketing reasons, renamed it the C43. It's been getting great reviews, although one "downside" is you may be looked down upon by other AMG drivers because this car isn't "one man, one engine". Who cares though, right? It's not like they're make your monthly payments. And it's available in sedan, coupe, or cabrio.
I really like the styling of the Benz (C63 or C43), the new RS5 from Audi is a beast of a car, and BMW combines performance driving with luxury like few other automakers can. First world problems, eh?
Go for lots of test drives. Ask lots of questions. Read the reviews. It's a lot of money, so don't just rush into a decision you may regret later.