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Longstocking I plan on taking a nitrox class.... so we want to be able to us air and nitrox with our equipmnt... if that makes any difference.[/QUOTE:whatever Regs you buy will be fine with Air or Nitrox - just make sure if you buy a computer it does both (and also has Guage mode as well just in case you need it later).
TSandM:As far as an entry-level regulator goes, I think the Aqualung Titan has been a very good choice for us. It was recommended by our LDS, was well below the cost of their top end regs, and has performed well in cold and warm water for 150 dives for me.
I suppose what you buy first could have to do with how satisfactory what you can rent is for you. If you are a very small woman and can't find anything in a rental BC that is comfortable and stable, you might want to buy a BC first. But regs are much easier to carry with you when you travel, and are such critical pieces of life support that I think I'd buy them first, so that you know what you have and how it's been cared for and serviced. You can, of course, find many discussions and differing opinions on this in the SB archives