I use an Edge 800 for brevets, and it has been pretty successful. I think you can still buy new ones. I think I would skip the 1000, but I know randos are using the 810 successfully. I could see using a 500, but I would want to save maps on my phone. And lots of people report problems with charging while riding, although I think that can be solved.

I almost never display the maps on my 800. But if you enable turn warnings, the device shows a map of the turn. It's pretty handy

eta: just noticed your location. I was thinking about riding my 200k to Lewisburg tomorrow, but it looks like that is going to be rained out. I have 8 approved permanents starting in Boalsburg and State College with more on the way.