Well, you have to think who you're asking

We are all a bunch of crazy MB fans~~~So you know what we are going to say! Fix It and keep it!!
That is, providing it won't be a financial strain on your family keeping the car up. The world is full of lots of $1500 cars that require less $$ in upkeep than an MB. If you have a little play cash, this could be a GREAT car to keep. The only thing that is a major issue as I see it, is the climate control.
Otherwise, sell it to another MB fan. Sounds like a pretty nice car, would love to see some pics...
Good Luck!
-GH