I sold my 85 wagon last fall for $8200. No rust, perfect interior, just rebuilt tranny, brakes and 210k miles. People on various online forums thought I was way out of line on the pricing. It sold the first day I posted it on my local Craigslist and I had two other people waiting to buy it.

I used the pricing from www.nadaguides.com, and $8200 was within their range for this car.

Good luck.

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1970 280SE Cab
1983 300D Euro 4-speed
past MB's:
1971 280SE 3.5 s/r
1981 300D
1985 300TD
1987 300TD