Do a search for CLK cabriolet or convertible on the forum . First consideration would choice of engine. These cars were marketed during the M272 V6 and M273 V8 petrol engine era so any cars with those engines require close scrutiny. Powertrains are otherwise reliable if looked after. Many will be second cars with few owners and lowish miles for their age altho they are now getting on a bit so don't expect many 1owner 30k miles examples! The one thing I always emphasise is hood condition and operation- condition must be good andit should work flawlessly- anything else walk away.