I've been looking over and over at dive computer specs, but I still need a little help deciding. The features that I'd really like are: Air integration, wrist/watch style, nitrox compatibility, user replaceable battery, and the general - audible alarm/backlit display. Ideally, under $800. I did notice that Ocean is giving free transmitters for the VT4.1 and the Atom 3.1, which are in my price range. I was just wondering if anybody has used either of these computers or has suggestions for others? It seems like the VT4 might be a bit big for an average female wrist, but I've only seen it online. How are Oceanic's dual algorithms?