I hate to be the turd in the basket, but realistically, you need to expect higher-than-average maintenance and repair costs.
It will cost at least $100-150 per month to keep that car on the road over a 5 year period. This will come both from regular service, expected replacements (brakes etc), and some "oops" items probably in the climate control, electrical, or suspension areas. You need to be prepared for some four digit invoices.
This is a sophisticated automobile and parts are expensive.
Be realistic, but don't let this deter you: it's a great ride.
Falls Church VA
'86 300E 5 speed
'95 C220 (wife's car)
'98 Porsche Boxster
Past: '79 280E, '82 300D (18 yrs), '77 240D,