The right buyer $800 complete care might add $100?
Problem is $1000 buys something better new? Some will be thinking maybe $600? It is three times removed from current platform.
Used notebooks have terrible resale value. Consider DeLL Outlet a new not used but ordered Studio 15 w/ 2.1Ghz Core 2, HD4570m, 4GB RAM and 500GB HDD is $860? I know not an exact match but new for $860 makes yours lose a lot of value.
I would not pay over $550 tops sorry. But like I said the right buyer who knows.