There seems to be some crack being ingested on ebay as well:
http://cgi.ebay.com/ebaymotors/Beautiful-300D-Turbo-Diesel-Sedan-in-Memphis-58k-miles_W0QQitemZ320024031607QQihZ011QQcategoryZ6330QQrdZ1QQcmdZViewItem
come on, have we now come to the point that someone would really pay $21K for a 1984 300D Turbo Sedan? Even gorgeous low mileage SLs go wanting at that price. And those were $60K when new.
I know this seller is a board member, but seriously, that's got to be close to the sticker price of that car when it was new. I suppose if the market will bear it there's as nice an example of a 300D as you are likely to find, but still, it is foolish to spend that much on that car, IMHO.