I believe the AMD build has a better future for expansion . The motherboard can crossfire and SLI . It does that by actually using a 990X chipset rather than the 970 in the name
You could save $25 by using the Extreme 3 which cant run two graphics cards .
The intel build is also a good build . It lacks the option to overclock in the future but that may not be important to you
I went through the win7 vs win 8 choice about 8 weeks ago . I eventually chose windows 8 because it was bundled as a promo . There is a learning curve and set up was a little more difficult with the motherboard drivers , but Im glad I did . The enhancements are useful .
And I have added a start button using a free program called classic shell .