KEEP THE CAR!!!!! You do not have to be an expert to fix that. A garage and some simple tools is it. Take the money, spend no more than 1k in all parts, and fix it yourself. If you get parts that aren't your color you may have to paint it, but I would keep it. You could basically make money if you are satiafied with your work.
Do not listen to the men at the shop, they want your money and business, always.