A fair price?

[LEGENDGH]

I have been offered a LG 50"PC1DA plamaTV (£1,600 new, now £880), a LG LHT550TB HTK home cinema (£176 new, now about £140) and a SERANO STAND (£175). All this stuff is new last November, got the bills, and was only used for weeks because the person who bought new emigrated. Including the extra cables bought at the time, they paid just over £2,000 inc del. What would be a good price for me to offer without it being embarressing? I was thinking £500. Thanks