For a W124 coupe with low miles and in good condition, you'd better run away and hide, because you STOLE the car at that price....

They're very fine cars, and fine looking too, and by observing your signature, you have plenty of experienced owning older Benzes. How are the wiring harnesses, the Climate control system, and are there any head gasket leaks? Those seem to be the largest expense things to watch out for. Otherwise, just maintain the car well. Those I-6 motors were one of Mercedes' best efforts.

Could be the gears in the seatbelt presenter mechanism are worn.

Consider the purchase of a set of Euro lights for the CE, thy will look better and are much brighter, with a better beam pattern, than the US set up.
Other modifications, like wood steering wheels, wood, shift knob, cupholders, floormats, sheepskin covers and differentwheels/stereo are such personal decisions, I'll not comment on them. You could leave the car stock and have a very fine automobile.

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1991 560 SEC AMG, 199k <---- 300 hp 10:1 ECE euro HV ...

1995 E 420, 170k "The Red Plum" (sold)

2015 BMW 535i xdrive awd Stage 1 DINAN, 6k, <----364 hp

1967 Mercury Cougar, 49k

2013 Jaguar XF, 20k <----340 hp Supercharged, All Wheel Drive (sold)