If you want a new motherboard, look at what options you want/need and go from there. Personally, RAID and LAN are a big deal for me, and that's what I look for in a board usually. Don't get a loaded board with features you won't use. MSI is a bit cheaper than Asus, but they're pretty solid as well. Asus is good, but you do pay quite a bit for their products.
Again, I don't think you're gonna get a real significant boost by getting that board---at least that you can't tell by benchmarking.