My personal opinion the crosshair is the best but I am biased towards ASUS. The UD7 is also great I have heard. Looks like a killer build you have going on there.
Yeah, most people choose the Crosshair IV or Gigabyte's UD7 for their 6-core cpu. MSI's 890FXA-GD70 is a good board as well, but many people have faced problems with it, so it lost it's credibility. You did good in choosing good parts.
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