Thanks all for your replies.
The Lowrance LMS 337 CDF has been discontinued and replaced by the Lowrance HDS-5... 5-inch color screen and $799 at Defender. The comparable Garmin unit was similarly priced.
Standard US Basemaps spund adequate for both units... navaids I want, marinas I don't care about.
I am not averse to spending $$, but nor am I an electronics junkie with desire for the very fanciest.... sounds like this is the sweet spot I should be looking in. The comments about fog (where I am not very experienced) gives me pause with only a handheld.