Whilst your expected price would appear reasonable for a 2 year old laptop, if you are selling it privately you may find it difficult to transfer the warranty to the new owner. Whilst you are leaving Office 2003 on the machine, you may well have a problem if you install this software on your new laptop when you come to register it or obtain any updates.
A second hand retailer may be able to get a better price, if you can find one that will sell it on a commission basis, but they are few and far between.
Unfortunately, despite the considerable price paid, this is only a relative value to you with the way that technology moves on at a rapid pace.
Good luck, hope you find a buyer.