As others have said here, your agent is best suited to help you with an analysis of the local market. He/she will be able to analyze the neighborhood and the comps with more up-to-date information than is available to you. If you are an unrepresented buyer or seller you are depriving yourself of an expert and a professional, trained to do exactly what you are asking.
In very general terms, when an offer is accepted it's because the offer is between 94 and 100% of the list price. The seller thinks, "I got most of what I wanted." The buyer thinks, "I got a little bit of a deal." Then you have a successful transaction. But remember, the appraiser will have a big influence on the ultimate outcome. I live in Monroeville and I work in Murrysville. If you need an agent, feel free to call me. Randy Berner...412-302-8351.