Julie,
I would always get an air integrated computer because it can do a better job of monitoring dive time remaining by monitoring both air consumption and blood gas accumulation. I have an Air; it is recently out, about 1 1/2 weeks, so support is a little behind. I have the download kit, compass, and face cover on order and the Mares Rep is not sure that the pieces are even in the US yet. Check the on cyclinder readout prior to purchasing. When the computer is on and attached to a pressureized cyclinder, it does not tell you anything - no pressure, time, date, temperature, etc. This is beginning to bug me since my other computers (Cobra and ProPlus2) both told me the pressure at a very minimum.
Perry