Holy cow!
It seems every decent AMD card is sold out EVERYWHERE. I could not find a 7950, 290, 290x or anything else remotely similar anywhere. Prices on ebay are absurd.
After mining for a little bit with my measily 5870 in a desktop, I decided today it was time to build a proper 4-5 GPU rig. Looks like that is not happening. It looks that I could also sell the 5870 on ebay for more than I paid 2 years ago, but it's too profitable to let go.
Everything I have read says the 7950s are still the best price / power / performance. That being said, they're next to impossible to find at decent prices and even the couple I have had to RMA to Gigabyte recently are coming back as 7970's now.