If your going for the red/black theme then your only quality choice is the Asus Crosshair IV Formula or Extreme, which sell for $210 & $300 respectively. Otherwise I would recommend the Asus M4A89TD/Pro USB3 or Gigabyte's GA-890FXA-UD5 for $175 & $180 respectively.
If you don't mind taking a small performance hit in graphics, drop down to the 6850 so u can put the savings towards the motherboard. Later on you could get a 2nd 6850 to put in CrossFire to enjoy increased performance. I always recommend XFX when buying AMD cards as they have great customer service & warranties
As for Win 7, just stay with Home Premium, it suits most users just fine
Good luck with your build and enjoy the new machine