I'll keep it in mind, but I think I'll have a long list of issues to deal with once I get the care here.
Strongly suggest that if you haven't got one already you buy yourself something like an iCarSoft MB-II scanner. You'll also need a set of Torx allen keys, male and female torx sockets.
Anything to do with MAFs, O2 sensors, etc. bear in mind the thermostats, or rather the temperature sensors fixed within them, have a habit of failing, especially if the car's been parked up a while, leading to all sorts of spurious fault codes as that temperature sensor is what the ECU uses to determine engine temperature and therefore how much fuel the injectors should be injecting for any given foot on the gas pedal position. if that doesn't correlate with what it sees from the )2 sensors in the tailpipe it senses something's wrong and often reports it as the O2 sensors and / or catalyst when it's actually the temperature sensor in the thermostat causing the problems
Ignition coils can go too. There's one coil on top each spark plug. If you've got a bad one you could just replace that one, but they often fail in rapid succession one after the other. It's old age, nothing more.
Thermostat, MAF, camshaft position sensors and coils are all easy driveway DIY jobs. O2 sensors (if they really need doing) should be do-able too, you'll just need jackstands to get under the car. A low profile hydraulic jack helps. Crankshaft position sensor is a pig I am told, however.
The serpentine belts and / or pulleys can fail from 45k miles and up, and it's worth checking both the idler pulleys and the tensioner pulley for "notchy" turning or excessive along-the-shaft or radial movement when you do the belt.
Other than that on the hardtops there aren't really that many things that go wrong other than mileage related wear and tear / old age.
CLKs are notoriously hard on tires too.
Get to know www.genuinemercedesparts.com
if you don't already.