I was sort of leaning towards no larger than a 9". I printed out roughly to size the 12 and it's huge!!! It would be in the way most of the time I believe. I'm not sure I will add anything (livescope or 360) other then the fish finder. It's nice to have the option though if a deal or price drops happens. Glad you pointed out the resolution, silly me was just assuming they were the same or close. $500 more though for the humminbird. I still have to get battery, cards, etc.... budget might be deciding factor. Question, does the humminbird have a quick disconnect like the garmin units? Assuming they come with a cover?