i have to say im a little biased. ok a lot biased! for me having the choice of a hardtop or a vert in 1 car seals the deal for me. the slk wins hands down. to be clear the only m/b i consider owning and do own would be the amg models. the body styling, engine upgrades and suspension are a great pkg. of course mine is a r170 model. 13dog has the newer r171 and its a slk55 which is an amazing car also.
drop a cayman in my driveway and i wont complain! i looked at a couple and the biggest complaint i had was the crazy way to drain the oil and refill. from inside the cabin!