I've been using an intova sp2 for several years. I just like having a camera to document my dives and to share my experiences with my friends and family. The sp2 has served those concerns well, but it can be a little hard to use so I was looking at one of the go pro knock-offs. Are they pretty much all the same or does anyone know of a particularly better one? I'm not really interested in paying more than $100. I'd like the ability to add a red filter and to use go pro accessories. Thanks in advance.