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Whatever you do, do Not let the garmin choose your routing.
A to B routes on the edge series are abysmal at least with the etrex series they will allow you to choose numerous intermediate points if planning routes on the device unlike the edge series that only allow you to choose an end point.
Much better to plan routes off the device using one of the many websites available.Such as ridewithgps.com
i have had the Edge touring for over a year and over 10 k. i also use it for navigation and basic data recording, still haven't experienced any crash with it.
at a significantly cheaper price than the upper models, you get the same navigation and route-finding features.