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mjef-
If mapping/navigation is important 810 has far more comprehensive navigation, else possibly 520, esp if interested in live segments etc. If you just want something to reliably upload rides (time, speed, segments) and have a laptop go for 500 or 800 as cheaper options. The 10, 20s have Bluetooth and think you can sync phone so notified of text etc
Pasty_Spumante
500, 510, 520 also compatible mate