There was an interesting post a few days ago about a person who purchased a used ML (don't know if it was STARMARKED) and they needed a new key, but since the car had been through it's alotment of eight keys a new key was going to be over one-thousand dollars because it needed new computers etc.

So do a search for that post and find out how many keys the used vehicle has been through on any used MB your interested in.

And with the present body style 203 C-class no longer being produced deal for a great price on any 2007 C-class your interested in.

What year C-coupe are you interested in? I'd probably stay away from a used C-coupe if reliabilty were the single most important factor.

Tough I personally think the 2007 C and E are very fine cars.