TerryS, you go 'head and take the guy's word for the 'no rust' claim.
It's a Chicago car- have you ever been to Chicago, and if so did you happen to notice that all the cars people drive up there look like Swiss cheese?
Rust is like an iceberg. No rust on a 19 year old car from Chicago?? yeh right
I'd be willing to bet big money that I could find some rust on that very car. Might even be able to find a lot. Might even find that the car is structurally unsafe to drive. Forget about the #14 head issue. That guy might not be qualified to assess cars in general, and there is a possibility that he might even be lying. For 10k, I need an absolutely perfect w124, that means no issues and perfect in every way.
I don't even care about w124s so I'm not pissing on him out of jealousy, only because he richly deserves ridicule for that ridiculous asking price.

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'02 BMW 325i
'85 300D 450k
'93 190E 2.6 170k(killed by tree)
'08 Ducati Hypermotard 1100S 6k
'06 Ducati S2R800 14k(sold)