I was looking at the Lowrance LMS-527C. But I notice for about $300 more I can get a Humminbird 797C2I SI side image. Is it worth it to have the side imaging on the smaller unit where you do not have the large screen? I would like to upgrade from my 2 current eagle ultra II finders. They are quite old units. I have one mounted on the console and one on the bow now. I definitely will not be able to afford 2 new units. Should I look at getting a transducer for the trolling motor and one for the transom and moving the new unit back and forth? I spend more time on the big motor on the lake, and more time on the trolling motor in the river and creeks. Thanks for any input.