I was going to order one of these but there is a option window for 4in display 1200ft. 4in display600ft. 5in display 1500 ft. Now I usually dont fish lakes more then 100 ft deep but I would like the bigger screen. Would this option be critical for what I want it for, just fishing on a 12ft boat. I usually go with HB but heard good things about this little finder and great reviews, and the price is right, what can you guys tell me about those options, price does not change on any selection