G.Skill Ripjaws X DDR3 1600 PC3-12800 16GB 4x4GB CL8
I use the same memory. In BIOS, set OC to X.M.P for best results.
The Corsair is another alternative. I believe this is a little more expensive than G Skill (Here in Korea anyways).
And why not 1.65V of Kingston HyperX?
As mentioned, Sandy is rated for 1.5V. Using 1.65V can cause instability/damage to components.