I'm in the market for a new fish finder. I've been thinking I would wait till I see the Garmin echomap plus 73sv on sale for $500 like I saw last month. Today I see this one Cabela's Online Store - Quality Hunting, Fishing, Camping and Outdoor Gear

Does anyone know how the mapping on this compares to the echomap plus mapping? Any of these units are probably a little overkill for my little 16 foot 1973 Mon Arc but the bird I have on it right now has a problem. I was thinking the Garmin if found at the right price was a good all around unit for me with good mapping already built in but now I'm thinking this might be good.