ECS is mostly a budget MB and usually doesn't have good OC options in the BIOS but you don't need that any way.
The 780G OB video will score like 2000 in 3DMark06,it blows away the old OB stuff.
I wasn't concerned about OC'ing at all, but I was concerned about quality/reliability. I do trust Asus in the sense, but I have no experience with ECS.
I'm still considering both boards. Thanks!