MyFishFinder.com Just like iceshanty but warmer
When I contacted Garmin for a recommendation ....they suggested the Etrex 20 ...can add SD map cards ...and make custom maps via Google Earth and a overlay map downloaded to device (pretty simple ) ...I was able to find a bundle (SD topo card ...carry case and unit) for $149 .
Your approach sounds well thought out.I have a 62 and love it. WS