Thinking about some new electronics for my boat, I have a Lowrance 5300C that I can move from my dash to the back of my boat for trolling, getting tired of moving it back and forth so I would like to get a combo unit for the back of the boat so I can leave the 5300C on the dash. Thinking about going with the Lowrance HDS-7. What is the comparable unit in Humminbird? Down the road I would also like to replace the fish finders I have on the dash and the bow of my boat, just need a basic color fish finder and looking for suggestions, I am leaning to sticking with all Lowrance as I really like my 5300C and have had no issues with it but I am open to other opinions as well. The pics are my current set up.