Unless you are fluent in German and plan on smuggling in a mechanic from the old country you will never want a 10+ year old Mercedes as a "driver." Those were very advanced cars for their time, an E or C class can easily be a driver but an S/ SL/CL car is going to be very pricey to fix (as in purchase price could easily be duplicated in repairwork in the first couple years of ownership). Call the dealer and ask what a new Key fob costs, the old jackknife keys are famous for falling apart. Don't be shocked when you find a key is $200....