Have you thought about going the ebay route? A used Garmin Oregon series hand held can be had for between $100 and $150. Then purchase a Ram mount for the bike. Maps can be loaded for free. I used a 550T for a few years until I bellied up to the bar and bought an Edge 1000. The nice thing about the used Oregon is that after you are done with it you can sell it for close to what you paid. Even a few years down the rode....