You can get FSOne without a controller and use the DX6i with it. It includes an interface for it. Also, if you so choose, you can purchase a Spektrum wireless interface for it for about $50, allowing you to bind your controller to the system as you would to an aircraft Rx, and fly your sim without all the cords in the way. FSOne with a controller is $99.99, but out of stock. FSOne without controller, but with the interface cable, is $79.99.

Hope this helps.