I just returned from B&H. I went to do some more hands on with the Powershot Pro 1 vs. the DiMage A2. And I returned with one: the Powershot Pro 1.
Why? The swivel of the LCD; the structural feel of the camera; and I guess the odd chance that I might actually use some of my dedicated flashes with it - though that wasn't a big factor.
I didn't like how the LCD on the A2 is exposed - i.e. you can't flip it around to be protected. And the camera layout wasn't at all intuitive to me - though you could get used to it. The other factor was just all the quality control issues with the camera. I will keep the box and everything ready to return and see how it goes in it's maiden voyage. Incidentally, on the way down, I took a bunch of pretty good shots on the subway with the A75. I wouldn't toss that one away for anything. I think I would basically go out with both cameras in the bag.
So there you have it. Bank account is $1000 lighter (picked up a fast CF card, and an extra set of batteries).