We would need a lot more information to know if it's a good deal or not. I really like my car and I think I got a decent deal. 2700 for a 1984 with 160k. I did put 1400 into it immediately after purchasing, so that brings the cost up to 4100 for mine. That included a new windshield, front suspension, tranny work, misc. I hope my car will last another 200,000. There is no rust. Rust is a bad thing. The sunroof can be a PITA, or can be somewhat expensive to fix depending on the problem. I reccomend letting an independent mercedes specialist look the car over. Pay him for an hour of his time. You might want to get a compression test done to see how strong the engine is, but one of the most reccomended mechanics on this site doesn't do compresion tests...says he can tell without them. The ACC can be troublesome on these cars and can also be expensive to fix. How many owners has the vehicle had? Is there any records of maintenece/repairs done? With more information, we might be able to give you a better idea if it is a deal or not. I knew nothing about these cars a year ago, but with a lot of searching on this site, I think I can spot a good deal now if one would ever come along
Good luck and keep us posted.