I am looking at a couple of different 17' aluminum bass boats and some of them come with different brands of fish finders (Lowrance, Humminbird, Garmin) and i have also found Eagle (which has not been on any boats i have looked at). Is any brand better than the others as far as ease to use or quality? Most of the fish finders found on the boats i am looking for are basic models with 4inch screens, are these OK for a newbie fisherman fishing in local lakes? Also i noticed that some of the more extensive models have GPS. Is this more of an option for tourney fisherman that may be fishing in a lake that they are not familiar with?