Don't let these guys confuse you. Since you'e only planning to run two video cards, on the Asus side you should go to the Rampage II Gene. The components on the ROG boards are higher quality, not that it'll give you more clocks, but the board tends to be more stable and consistant.
Since you're running SLI my choice would be the EVGA boards. Even though the days of being brand limited are over, EVGA has a much greater support requiem for SLI setups, and frankly they are better at running them too. Where Asus boards are SLI capable, EVGA boards are SLI optimized, EVGA is fiercly backed by Nvidia, and very tightly linked with their production standards and implementation. Granted the Asus bios is thaught by many to be more streamlined, all their products that support SLI are notoriously finicky. If you don't mind putting in the extra 5-10 min. to thoroughly overclock your system, go with the EVGA board.
By the way, spend the xtra couple dollars on buying EVGA 275s too (what's $15 when you're spending $1200-1400?). By keeping your system al of one Mfg. you save yourself a load of headaches in the process, especially if you have warranty/driver issues. Don't forget your driver upgrades too, EVGA revises their drivers much more often, and can optimize their drivers to run more efficiently within their own product line. One of the most common issues with performance beyond the hardware itself is driver issues, and conflicting drivers from multiple Mfg.
Rmember clocks aren't everything, effiicient latencies are important too. That's why a lot of people say the Asus boards perform better with the same clock. I will admit, in most crossfire rigs, the Asus gets the tip of the hat for more FPS per clock than an EVGA, but when you combine an EVGA board with EVGA cards you get comparable performance (and in many cases superior). The biggest thing I tell people when I go through this with customers is that I could care less if I get the same performance (within two or three fps +/- ), the reliability, driver, warranty, and support are all worth it when using the same MFG.
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