My only real gripe with the Extreme7 is only 1 PCI slot. I went with the Asrock Fatality Pro Z68 board. Best board I've ever used.
Gigabyte looks like a good board. Price seems a little steep at $350. I had an AMD Gigabyte board. Died in less than a year. Have had great results with Asus. This Fatal1ty Board is my first Asrock, and it's the best yet if it holds up.
Here's the specs on the Extreme 7. Look like you can do dual x16:http://www.asrock.com/mb/overview.asp?Model=Z68%20Extreme7%20Gen3&cat=Specifications