I am about to order a new 20 TRX/250 Pro XS but I am struggling with what electronics to go with. I have always had Lowrance units but I am considering going with Hummingbird this time as the Minn Kota trolling motor has a built in Hummingbird sonar and that would eliminate a external transducer on the trolling motor. Also what is the largest flush mount Hummingbird graph that would fit into the console? Thoughts?