I agree that the wrist is the best way to go. I dive with a Tusa wrist mount computer that frankly has very little in the way of features. It gives depth, ndl, time and temperature and accounts for nitrox up to 40%. I dive an analog SPG as well as it has my compass on it. I went with the simple wrist mount but actually bought it x4. Two for me and two for my buddy. We have redundancy and identical algorithms so that we don't end up screwing up one another's dives. I could not have done this with a more flashy/expensive computer. In my opinion, get the basics, make it redundant, and if you have the opportunity coordinate with the buddy/group you will dive with. If you were to lose one, or one buddy forgot the bag with their computers at home, they could borrow your spare and know exactly how it works.