OK, I'm gonna go ahead and open a can 'o worms. I am looking to upgrade my sonar. Looking between HB, Garmin and Lowrance. Want a 7-9" screen w/ SI, DI and maps w/contours. Needs to be easy to install, set up and use as I ain't no rocket scientist. Price range: about $800. I just want to catch crappie and bream!