Difficult choice. My store has all the major 8mp cameras now, except the Olympus, which we no longer carry.
I'd say it's a tough choice between the 8700, the A2, and the Pro 1.
The 828 is, IMO, a distant third because of the noise and purple fringing.
I'd probably go with the Pro 1, but I think that comes down to personal preference.
I would go to a store, and ask to try them out. A reputable store will allow you to make a test print on a decent inkjet or dye-sub.