How much better is the 56 over the 54 for side image and down? There are some good deals to be had for the 93 sv UHD with a 54, I am just wondering if forking out the extra cash for the 56 is worth it? I fish reservoir lakes around 60-70' deep, for bass and crappie, I am currently running a Humminbird 998c. It does pretty well, but I feel like a new Garmin would be quite an improvement, with either transducer. Just don't know if I should go all out or save a few bucks and be happy?