I would highly recommend Humminbird or Lowrance if fishing is your main use for the unit. Garmin makes an excellent chartplotter but their sonar is tuned more to be a depth sounder than a serious fishing sonar in my opinion. If you were looking for a GPS unit I'd tell you Garmin is the way to go hands down!
The Lowrance Elite units are a good way to go because the mapping card comes with it. Just be aware on the DSI models they only have Down Imaging. There is no traditional sonar in these units. In this category I would say Humminbird is a much better choice than Lowrance because their Down Imaging units have sonar and DI. You would need to purchase a chart for them though. Take a look at the 587ci HD DI.
-Lawren
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