My Garmin 500 has been having issues and it might be time to replace the head. I would like to purchase something that is compatible with the cadence sensor and heart monitor. I don't really feel like I need maps, so wondering if I should purchase another 500 or if the Touring has better features/performance than the 500. I assume it is newer technology. Or perhaps the 510.
Any comments from users of several Garmins?