Need to replace my C63 AMG soon - where do I go from there?

[MagicMike]

So the time is coming for the car to be replaced in a few months - my dilemma is:

1) No new C63 until later this year, do I wait?
2) The current model is such a great car, noise performance, looks , it has it all, but the depreciation and maintenance to keep it beyond 3 yrs will be painful. Don't think I'll get that past the Mrs
3) Grow up and get an ML63 AMG or Porsche Cayenne Diesel S

Looking forward to your opinions