I have the cheapest and oldest car (except for that W116 I guess)
a 1983 300CD-T!
So far it's bone stock. However it'll be that way for a while until all the problems are ironed out (even the smallest problems), then I might make some modifications...

I started from driving W124, W210 and finally I chose a W123 as my first car! I see nothing wrong with it. It's just a little odd among all the new cars in school I guess.. (I'm a freshman in college BTW)

I did not pay for it. My parents were quite happy to let me buy a newer car (E320/E420, etc.). I just opted for the CD for a few reasons.

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2008 BMW 335i Coupe