I went to the dealer to look at a CLK 500 two weeks ago. There were a few things that changed my mind and made me less interested:
1) It is very hard to distinguish this car from the other MB models, even down to the lowest C-class ones. Even the salesperson had a hard time finding the CLK on their lot amongst all of the other lookalikes. For $53000 I would want some differentiation.
2) It had too many luxury gimics that cost way too much -- the funky cruise control thing, for example. And even the ones that were free, like the little robot arm that hands you your seatbelt, I found to be over the top.
3) No manual transmission.
It is a very nice car, though, if the above things don't matter to you.
Good luck!