Downloadable application for Macintosh

I am looking for somebody to write (and then support) an application for Macintosh. I already have the application for windows platform (.net c#).? You can look at the application here [login to view URL] You will download and look at the application and will tell me how much will it be for you to write something similar for macintosh. I am looking for very high quality product.? You will add me to msn and we will discuss details during the development of the application. You will write the complete application for me with installation.? The point is to make the exact copy of the current windows application for MAC.