Well, I will mention this car as you appear to have an affinity for rare cars. The gentleman that I purchased my car from (Maple Yellow 79 300SD W116), Mr Diesel, has another car for sale. The reason I bring this up is that it is 'oddly' rare. The car is an 85 300D. Granted, the 123 is not a 'rare' car, an 85 300D is rare. The last year the D (normally aspirated) was sold in the US was I think 82.
I know this car well as I debated between my car and this car. It is in amazing shape with only ~60K documented miles. Stil has the CA blue plate.
Not sure if this is a fit for you, but I thought I would let you know. It is rare in the fact that it has 60K miles and normally aspirated.
Here is the link to the car...
http://home.comcast.net/~mr.diesel.info/85_300D_Green.html
Anthony