I fall into your camp - ride for fitness. I was using MapMyRun, and it provided pretty much what I wanted as far as info goes. Decided to get a Garmin 520 Edge Plus when the price dropped to about $200, and added the speed and cadence sensors for an additional $60. It works really well for my needs, and I did not see any reason to spend more.

One of the nice things that I have not had to use fortunately, is the feature that send a message to your emergency contact if you crash. Since I often ride by myself, it's somewhat comforting to know that my wife will be notified in the event of an incident.

An added bonus is that the Garmin controls my Bontrager lights - on when moving and off when stopped. And, it syncs with my phone so I can get the ride data on it.