My dad has a SD and I had a CD, both turbos, and yeah the CD was faster. Rides good, pretty smooth, but the CD is lighter and you can tell. Probably want some lower springs right off the bat if you can. No back seat space in it tho. I upgraded to a W124 300CE, but for a diesel a CD is a good choice, got lots of compliments.
For parts, wasnt that bad, just like any mercedes i suppose, unless you want it perfect with no leaks and stuff, but that goes without saying.