Original Cost. Your price is determined by today's market.
Investment in Improvements. Potential buyers will evaluate your home (i.e. wallpaper and carpet) and may include the costs to remove or replace in their offer.
The Cost to Build Your Home Today. A replacement value is determined for insurance purposes only.
Personal Attachment. Prudent buyers purchase based on their emotions, not yours.
Neighbour's Claims. Don't listen to what your neighbours tell you is the fair market value for your home. Other homes in your neighborhood may not be as similar as you think. Also the terms accepted by both the buyer and seller greatly affect the sale price.