I've gotta agree with the mole, again.
The sheer number of units sold, the availability of the rig and parts for it, as well as the necessary training, the accessability of it's users, its trackrecord (although not perfect) all are good reasons for the Inspiration.
Must be nice to have the option to burn $20K on just the breather ...
For that I'd get the Inspiration and the Evolution ... O2 integrated computer ... Kevin's Hammerhead(s if it fits the Evo) ... Bob's OC/DSV ... and now I'm about at $20K.
Or maybe get started on Twinspiration Hammerhead ... . Or, if all of that becomes to much Ambient Pressure, maybe a Megalodon instead of two different sized units. Get some variety into that otherwise boring life.
Anyway, I saw the CCR2000 at a dive show 2 years ago, and wasn't impressed. Read the literature, too, and that 400ft. dive on their website left me wondering, if I remember right. It's been a while. Haven't seen them since nor looked for them. The Inspiration is an easy and obvious choice. I've seen the Megalodon, it looked solid, and I think is worth checking out if CE certification is not mandatory.