First question would be what is your budget? I have the humminbird Helix 5 and 7 and love them but they do tend to get moisture in them if you don't remove them every time you pick up the boat, I believe the 9 has a moisture inhibitor that solves this problem but they don't put it in the 5 and 7's. I have had to send mine back a couple of times but HB's customer service is second to none and very quick about getting your product back to you! If you have $3,000 or so, you can go with the livescope system. Really nice system but out of my budget.