Dare I say it the 530 seemed to get good write ups as did the 830. But then you’ll be spending yet more on shiny new garmin products…
It is Worth looking used, I’m pretty happy with the 510 I had off ebay (sadly doesn’t do maps), its far from perfect but I paid relatively little for it and I have other devices as backups.
I do periodically eye up used edge 820s and touring devices to give me another navigation type device to add to the collection. There is something to be said for redundancy when it comes to garmin…