You must be honest to yourself about your expectations. Do not allow outside influences to persuade you to make a decision against your better judgment. Here are some guidelines for pointing you in the right direction. Buyers aren't idiots and they have shopped around. Insulting there intelligence is a sure-fire way of losing a sale.
People tend to know how long a house has been for sale, and neighbors tend to talk.
Be realistic and true to yourself. Also keep in mind that the vast majority of homebuyers obtain mortgages. It's ineffective and will not work in your favor. Market a few thousand dollars above your market value, if you feel you absolutely can not use the actual market value. This will allow you a little buffer to negotiate.