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Excellent question! It is the same question that one of my service techs and I have been debating, except we included the S560.I'm going to be buying a new second stage soon. I currently have a G250V and I'll be getting either an A700, S600, or G260.
Any opinions or preferences?
For what its worth, the A700 will be filled with air while under water so it wont feel heavy in your mouth. But the always seem to breath a little stiffer than the s600 or the g260. I am a big fan of the g260 and have been diving on one since it came out. It replaced my g250 I was using before. But of all 3 the s600 always seems to hold an easier breathing tune for longer. But the g260 has more metal parts, like the adjustment knob which makes me favor it over the s600.
Yeah quite a bit in the high 30s and low 40s.