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If you want to follow a pre-plotted course, then the cheaper 520 is fine for that. Not had any issues following courses so far, and it's how I explore new areas.
Replace the base map on the 520 by following these instructions
http://www.dcrainmaker.com/2013/05/download-garmin-705800810.htmlIf you want ad-hoc navigation then it's the 810/1000, although read Hippy's posts regarding Garmin's ad-hoc navigation.
'my first garmin' post...
About to bite the bullet and go for one, mostly for nav/mapping purposes on longer rides. Don't know the neighbouring countryside of East London well enough to navigate out and back in stress free. Looking at Edge 810 - anyone got any serious issues with it / strong reasons why another model would be better? £219 on Amazon seems reasonable.
Thanks