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You will probably use the 200khz frequency more than the 83 or 50. Now you mentioned you are getting the HDI unit but the transducers you listed will not show the downscan imaging that the HDI units and produce. Make sure the transducer you get is either 50/200/455/800 or 83/200/455/800
Otherwise the HDI unit would be pointless and you would be better off getting the base elite 4 with gps, which should be cheaper. If the 83 and the 50 are the same in price I would opt for the 50. I would also opt for getting it at west marine even if paying a little more, due to their customer service and replacement program.
Hope that helps.
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