A solid selection there i think, what sizes are those btw ?
I think the 5 spoke is a bold statement on that styling, and seems to sit better with the design concept, i've been looking at this lately too for a C350 Coupe, and have sort of narrowed down the 18" rims i like
(images all courtesy of alloywheelsdirect site)
AMG VI - Mercedes High Sheen with Titanium Grey
Mercedes 5 Twin Spoke - Mercedes Titanium Silver
AMG IV - Mercedes High Sheen with Standard Silver
AMG IV - Mercedes Sterling Silver
Although going away from the 5 spoke design, these i really like (although a 2 tone colour option might be nice).....
Brabus Monoblock VI - Brabus Polished Silver
Those all come in at a similar price (not counting that the Brabus ones need adaptors) except for the Mercedes 5 Twin Spoke, which are about half the price, and a very reasonable price it is too.
If i was to decide to stick with 17" rims, i actually quite like the original sport wheels for the coupe (although i have seen a LOT with kerb rash on the spokes because of the design....
Mercedes Hoedus - Mercedes Titanium Silver
But like i said to start with, i think you made a solid choice there