I've had a C55 AMG and now my daily is a 204 c350 Coupe. Big plus for the C55 is the 367hp 5.4L v8 which sounds awesome and it handles slightly better. C350 (306hp model) will give you a very decent performance and won’t be too far away from a standard C55. 204 will still be under warranty, more modern, looks better, better gadgets and you will benefit from CDi like mpg! I’m averaging 37.4mpg in the last 14K miles I've covered in my 350 Coupe. If you’re going to use it daily and put 15K miles plus a year then I would say the 204, otherwise C55 AMG. Both amazing cars, imo.