HVAC Feedback appreciated -

A good baseline to get price comparison is a publication called RSMeans. I'm not sure if you have access to this, but it lists equipment and labor costs (as well as typical contractor markup) as well as location factors and can be used to give you a good baseline to work from. They release a new series every year.

This also begs the questions of whether or not you are looking to upgrade to an energy efficient unit. Does your unit fire oil/gas/propane? Are these efficiency incentives available in your area from the utility companies?