I wouldn't get the proton I'd get the abyss, much better reg. It set the current or the last open circuit deep record and works 10 times better below below 200 (i've used both below 150 I can tell). Envoys are very good, if you want more adjustment they have the envoy deluxe, Zeagle also has a non-environmentally sealed high flow model the new flathead XP, it is a champ. the mares abyss is a dry 2nd stage upside down and everything, zeagle is not. like I said before know where you are going to get it serviced and make sure that shop is an authorized service center before you buy. Some shops can fix anything, but most cannot do everything under warranty and thats what saves you $. BCs get a zeagle, they are the only one who backs it up with a full lifetime warranty that I know of. Get the lift and dimensions for the diving you do, don't overdo it because someone tells you its the best, but try it on first make sure it fits your body very very well. Computers: if you get one on a hose do not get a quick connect, Paragon makes almost everybodies (oceanic, scubapro, sherwood, aeris) I and am all too familiar with fixing leaks out of these quick connects they all will leak when you don't want them to.
