Depends on what your wants/needs are. If you use your electronics alot and rely on them alot. If you do alot of running in rough water that 5 inch screen can be hard to see. I run 2 - 7 inch screens. At times I have a problem trying to watch where I'm running and glancing at the screen without hitting that next wave wrong. You only have 2 seconds or less to look at that screen in nasty conditions. Your probably going to have the unit for 10yrs or more. So plan now before you buy. Like everything else, buy the biggest/best you can afford at the time. IMHO