I fish a lot of ponds and small lakes with the depth range usually topping out at 35ft. I want to get a finder for the bow of my jon boat and have been looking. I have a humminbird 597ci hd di on my center console so I am aware of the capability of that. I was wondering if one of the finders, ie, humminbird 561, 718, or 571, which are grey scale sonars, will show fish decently. I just want it to be able to show fish while I am fishing on the bow, so I can find schools or individuals when I am fishing in about 10-25ft of water. I am open to other brands, I just used the Humminbird for an example. I also cannot exceed $250, which is why I am looking at the midrange grey scale models. Any help is appreciate, thanks.