Trakmaps has an extensive list of devices it supports, so I filtered the results with some initial criteria that were of more value to me (min. 3" display, waterproof (IPX7), and internal microSD card). This left me with primarily the Oregon 600 series, and the Montana 600 series. The Nuvi 550 also looked good, but it was listed as discontinued on the Garmin Website, although it's probably available in the aftermarket , or on EBay.
My mapping criteria is New Hampshire, Maine and Quebec for Snowmobiling, and Southern New England for Geocaching with my Grandkids. Whether I get SD cards or download maps is unclear to me right now.