Chev, I believe that the system that g17jimmy described will be adequate. You have more cooling days than heating days. In your geographical location, a heat pump would be the most economical system for an all electric application.
You could contact two or three or more HVAC contractors in your area and have them quote a system. Act as though you do not know anything and let them sell you. You will gain an incredible amount of info for $0.00. Ask a lot of questions and let them impress you with their knowledge. This way you will become educated and have more info for a decision.