I also have an 800, had an 810 have a 1000, have one of their car Garmins and had a Vista HCx.
Edge units are best for cycling. Bigger the better for me because I tend to do lots of rerouting on-screen. Phone can be a backup normally. etrex only comes out for races.
My overkill race setup is:
Garmin Edge 1030
Garmin etrex 30x
Waterproof Android phone w/ RWGPS and OSMAnd