I think maybe the best idea for you might be to float up next to someone who is fishing in those areas and ask them what they are using and why. The areas you fish sound like they are all pretty shallow? The guys who are fishing in there, and have been for years will know what works. What I like may not be the best for your waters. All that being said, usually the advice given is "buy the biggest screen you can afford" because bigger is better/clearer. If you are fishing shallow water, a Side Image may be the best because you just won't get much info looking down (DI) due to the shallow depth.