May I suggest that you consider Orion Blue instead? The trend in car colors is toward brighter colors and I'd expect that in the relatively small SLK, you'd be thrilled with the Orion as am I. (Although, I'd be very happy if I have the only Orion Blue 55.)
It is still pretty dark in a classic way when in the shade or when the sky is overcast, but really has beautiful depth and highlights when the sun shines on the metalic flecks in the paint.
See the URL below for pictures.