You need to get in touch with an agent in order for you to make the proper decisions needed. They will be able to tell you how much a particular property should cost before you make any offers. Find an agent near you and start working with them now. This way, when it is time for you to purchase a home, you will be fully prepared.
Hope that helps.
Terrence Charest, e-Pro
Century 21 Associates
905 Easton Road
Willow Grove, PA 19090
In general, since we are in a buyer's market right now, in many sale price is lower than list price, not by some average % though. It depends on a house, why is it being sold and why would people buy it, as well as on where did original list price come from. If a house was overpriced, sale price will be lower than list price, if it was priced right than sale price might be higher. You can't just generalize.
PS: Of course id depends on if it's seller or buyer's market, simple demand and supply. In a sellers market when you get 5 offers from an open house, if your offer is below list price they probably won't even talk to you, today many people are just happy to get an offer at all. So you as a buyer have a negotiating power you didn't have a few years ago.