In terms of resale value, a manual should be cheaper than "the more desirable" automatic which was a £1450 option. Colour is preferred to me metalic, both because it looks better and doesnt scratch just as easily as MB water based non metalic paint.
Look for full MB history, have it HPI checked and get it inspected for accident damage.
Dont get too uptight about classic, elegance, advantgarde as its possible to get a C180 classic with leather, climate, decent ICE, alloys etc and a top of the range Advantgarde/Elegance with cloth seats, and no toys.
Let us have the full spec and we'll comment further. BTW if its a manual car you do realise you cant hill start it unless you have an extra leg graffed on to your body!
I'll get my coat...........