Halfadder...I always found the Asus CUSL2-C near and dear to my heart...but snaps to the P3B-F.
For new boards, whichever one fits your needs is the best for you. At this point in the game, most of these boards are so tweaked for performance that I doubt anyone could tell the difference. I don't get the whole SLI thing...just don't see the need for that much heat in my case, so I would tend to lean towards the MSI Neo 4.