Prior to switching to a GTX 590 I had 2 6950s in my system, my reason for the switch was purely based on OS support but I'd be more than willing to give AMD a try again if their Linux / OS X support has improved.
Loved my old 9700pro and rocked it till it died. Same with my X800XL. Mobility Radeon X1600 was a blast too. I would really love to get my hands on one of these and TWO would be amazing. ATI has always made great hardware, and I really love AMD's decision to purchase them. My current HD-7750 is going to be sent back for warranty purposes (it happens), so I'd love to get some 7870 action going here.
One thing I've always loved about ATI/AMD. You take criticism from your fans and critics, and you actually listen to what people say. I really hope you all pull out of the financial pit and keep doing what you do best!
This would be a great upgrade from my 5770, currently in my rig. I like AMD products because they help keep the performance market competitive and affordable. Any tech company without competition slows innovation and keeps prices high.