Fred, what you have here is the classic Spare Air splatter fest, wrapped up with the Air2, AI wrist computer, and long hose splatter fests, too.
As with so many things, try before you buy. It sounds like you'll be spending at least as much money as a cheap car, and you wouldn't dream of buying that without a test drive, would you?
There are definite compromises with every gear setup, including the ones you are considering. Get those configurations into the pool and try them out - like breathing off an Air2 while managing bouyancy at midwater. Or try out a long hose. At least try them.
I can fill your ear with advice, but it's what's good for me, not you, if you catch my drift.
FWIW, I am completely agnostic in gear configurations. Complete Hogarthian for overhead, standard short hoses for easy no deco recreational, double hose for shooting macro. I've even dove with a stage bottle, twine, a bathing suit, and nothing else, (okay, a mask and fins) and at the time it was the perfect gear setup.
So try it. It might be the right thing. Have fun with it while you shop.
All the best, James
PS - posssibly the cleanest rig I've ever seen was a DSS plate and single wing, a short hose DIN Atomic reg with an Atomic SS1, and a Suunto D9. The gal diving it had hundreds of dives on it without dying. I remember having a knee-jerk reaction when I saw it - OMG! - but after I thought through it, I was admiring it for it's particular advantages.