Check eBay
Good place to start - search on your model name, and track a few sales until they are finished to see what price they bring.
I would try to get the DVD issue resolved if you want top dollar, even if it's repalcing it with a cheap, used DVD. I'd imagine that the price of a unit with a broken drive would be a lot less than the cost of replacing the DVD.
But if your time is valuable, let someone else do the repairs, of course, and move on to some NICE new Mac laptops!