Another question about fish finders

[wiperhunter2]

I'm starting to get a good idea of what I should be looking for when buying a fish finder. The new Bottom Line Tournament 480 Max has an 480x480 pixel screen, that is something that is good because it shows a big picture and good detail. When combined with 3200 watts of power I should be able to see just about ever fish on the bottom of the lake but the degree of the cone of the transducer is also important. A narrow cone is better for deep water and a wide cone is better for shallow lakes, some of you experts can correct me if I'm wrong so far. What I'm not so sure about is the RMS watts, I'm sure 400 is better than 200 but what does that RMS mean for me, as far as picking a good finder goes? Is RMS and frequency(kHz) the same thing? The last question is about FSTN, does that have something to do with the display? Thanks for any help you guys can give me. WH2
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