Just curious, but why these three vehicles? They're not exactly competing for the same market share.

The CLK55 is a step down in luxury and interior room, a big step up in performance, and a big step down in price when compared to the other two.

The S55 is a sedan and the other two are coupes.

Why don't you consider the CL55 in this group? At least then they would all have the AMG name in common.

If I were making the choice, I would get the CL500 just because it is the best looking of the bunch.