Just as side input, I would consider removing the second drive before selling depending on buyer. Most don't need that much storage and you may get more use out of it yourself vs. the small increase in price that you might see for having it in there.
Here's what you've got going for you: 4 gigs of RAM, dedicated GPU (1GB, to boot), and Windows 7, 1920 x 1200 resolution. Nice and big!
Here's the kinda/sorta cons: 17 inch + dedicated GPU = decreased battery life (which could be a con to some buyers). Portability would also be a concern for some.
Considering most computers lose half their value on the day of sale...I would say you could probably get about $1,250 out of it from someone who knows a little about computers. Maybe $1,750 out of someone who doesn't. I wouldn't decrease the value any more than that for it since it's got pretty recent parts.