Hey Gang, I'm new to the site, but thought I'd ask for opinions on GPS/Chart Plotters. I've been using a Garmin hand held (Vista) for the past few years to basically track trolling passes and mark caught fish. I'd like to upgrade to something that will accept the additional maps with underwater contours. The Vista only has 24 MB of memory. I'm watching a couple items on Ebay Garmin 478, and 182c. Trying to keep the costs low < 600.00. Any thoughts?