I have Lowrance HDS7 with sidescan tethered together with one at dash and one in front. It does what I need and I will have it for years unless I buy a new boat.

That being said, if I had to do it again I would go Garmin Livescope. Why the Garmin over the Hummingbird or Lowrance? I've not been in a boat with anyone with a Hummingbird unit. Lowrance is great but sidescan shows me what I just passed up. Livescope can show me what is in front, side, or behind me. For now if I pass a large school I mark and hope it is there when I turn around.

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