I'd say if you got $900, take it lol. $625 - $750 might be more the range to attract someone. I'd place little if any value on the vid card, optical drive, and HD. Not sure if I value Win Pro as more than $100, or less lol.
Just an opinion, though.
can always say "or best offer"
625 end is kind low imo... thats probably like 40% of the original cost.