I guess the question would be where are you going to be using it? What type of boat are you going to mount it on? What are you fishing for? Do you want a basic depth/fish finder or one with all the bells and whistles? I have a portable Hummingbird that I used for years before the lodge I go to in Ontario started mounting small Hummingbirds in their boats. Mine is nothing fancy. It gives me the depth of the water, basic bottom detail and symbols for fish. The lodge uses a small Hummingbird with depth in feet or meters, water temp, speed, bottom detail is better you can pick up downed trees, boulders, weeds. Fish show up as a fish symbol or lines. It won't plot your course or tell you where you are on the lake. Hummingbird, Garmin, Lowrance and Raymarine all have decent depth/fish finders in your price range. They all offer a lot more bells and whistles than the basic ones I've used. All seem to get decent in reviews in the 3 to 5 star range.