As an alternative, try looking at a W116 based turbodiesel. These seem to have a lower resale value then the 123 chassis diesels. I am not sure why, but it seems to be true. These include 78, 79, and 80 300SD. The only diference in the 3 are the 80 probably wont have the sliding roof panel.

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1959 Gravely LI, 1963 Gravely L8, 1973 Gravely C12
1982 380SL
1978 450 SEL 6.9 euro restoration at 63% and climbing
1987 300 D
2005 CDI European Delivery
2006 CDI Handed down to daughter
2007 GL CDI. Wifes