I'd go with the Ripjaws. I don't think it's worth the extra bit for the Eco sticks because it won't impact performance.
One thing to note is that you shouldn't get the P55A-UD4P. The Gigabyte USB 3/SATA III boards have an issue where if you Crossfire, the higher USB 3/SATA III speeds are disabled. For only $5 more, you can get the Asus P7P55D-E Pro that doesn't do that.