If you CAN stomach the $500 to buy a unit with a GPS (will loggable waypoints) you will never be disapointed. Typically these units also have better features and better resolution. (Like wider sacnning, better imaging resolution, sidescan ect).
With GPS - You can mark drop offs, productive spots and get within feet of that magic honey hole. Fish finders, in my opinion, are, at least in lakes around here, where we fish from 8-18 feet, with a few exceptions, are not used for finding fish.
Almost any less expensive unit will provide pretty decent features and give you what you are looking for (structure, depth and weedlines).
BUT Remember if you are using a fish finder to find fish there is a good chance you won't be as productive (so don't leave a promising area just because you get no fish returns on the unit). Find structure and weedlines and there will be fish.
Remember, to see fish (with cheaper units) you have to be right "on top" of a fish. Consider this - in 10-12ft of water to get a real return your fish needs to be within 5-6 ft of your transducers imaging cone (about a cone that is 50% as wide as it is deep. Thats a smaller shadow than your boat makes.
I have many, many hot spots where I've rarely marked a fish and they are awesome and productive.
This is my advice.
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