I think it depends, when I have sold electronics before (older model iphones, etc) you have to look at how much they are going for at the store (nobody is going to pay you $240 for it if they can buy a new one for $249 at walmart).
Another thing to consider is how good or bad you have treated it and search online (craigslist, etc) to see how much others are selling theirs for and the condition of those.