You'd be surprised how many people do argue it. I just don't see how the AMD midrange 280's can use as much power as the their flagship, and NVIDIA's top cards.
I want more than just raw performance in a card.
Although, we'll just have to wait until NDA lifts, and see how the 290's really compare. :)
You don't happen to know anyone with a Mac Pro do you? Plug in a 280, and see if the OS X drivers support it like it does the 7970/50's?