I just received the new Garmin Montana GPS and all I can say is that it seems to me to be the perfect adventure riding GPS. It has a 4 inch sunlight readable screen for easy viewing which makes a big difference compared to the GPSMAP62s (which is the same price). It is very customizable and has all the features you would expect on a top end GPS. Also it is fully waterproof and pretty rugged, I can strongly recommend anyone thinking of getting a GPS for their bike to get one of these.
http://www.garmin.com/products/montana600
http://www.garmin.com/products/montana600