Is the graphics card integrated or not? If so 300-400 is what I think you could get for it. If graphics card is not integrated then its hard to say because the card will add value to it
For 200 dollars, integrated graphics or no it'd be worth it if only for a backup box. If you can get the cerficication for the windows installation, even better!
with windows certificate and a graphics card you might even get up to 450 I think. That computer is similar to mine and I've been looking on ebay to sell mine and I see them going for 400-600