How much could I sell my camera for?

Back in August of 2009 I brought a Nikon D5000 that came with AF-S DX NIKKOR 18-55mm f/3.5-5.6G lens (that standard lens that comes with the pack.) It has gone though quite a bit of use, but, its still in pretty good condition. Does anybody know how much I can sell it for? (I brought it for about $900 dollars, so I wouldn't think of selling about that price range.)

All help is appreciated.thanks.

Added (1). I still have the box, and all of the accessories that came with it too.

$750 MAX: P

You can sell it $625 dollars.

Brand new D5000 is now 500 dollars, you could sell it for 350 dollars.

The D5000 has been discontinued now for a little while. Most places don't even have them in stock anymore. B&H Photo has a refurbished one for $485, body only. Another place you might want to check is Ebay and see what the average going price is for a used one. That would give you a better idea about what you could get for it.