A facelift late 2011 to 2012 car is what you want.
Ideally u want a 507 edition as they are more desirable, nicer interior with alcantara etc, lovely 19" 5/split spoke wheels, bonnet vents, carbon lip and stronger engine internals. But a normal 457 bhp C63 will Make identical power with a map etc... Performance pack cars also have stronger internals, carbon rear lip, composite brakes, alcantara wheel and 487 bhp. Locking diff is an optional extra on all cars.
Other great options are,
Reversing camera
Harmon Kardon sounds
Carbon interior trim
Carbon mirrors and boot spoiler
19" wheels
Lane tracking package
High beam assist
Radar cruise
Presafe braking