Setting aside the emotive issues of whether the C450/C43 is a 'real' AMG, how it handles at the limit compared to a C63 and what kind of driver it's aimed at, this car ticks a lot of boxes and is certainly something I'd consider.
The C63/S is a 'force of nature' type car and one hell of a motor but (for me) I'd still take the C450/C43 with rear biased 4Matic, simply because with our weather it will probably lay more power down more of the time, less spectacular but more efficient.
All depends what flavour of driving you prefer and from that perspective each to their own
So to summarise what your saying is the C43 is AMG for wimps?