Rust is the kiss of death for any MB. Here is a web site that has some decent buying tips for the W126 class in general. You probably know a lot of the obvious - make sure everything works or deduct accordingly to repair. There are still a lot of parts around but they some can get pricey.

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15 VW Passat TDI
00 E420
98 E300 DT
97 E420 Donor Car - NEED PARTS? PM ME!
97 S500
97 E300D
86 Holden Jackaroo Turbo D
86 300SDL
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