Memory doesn't matter for overclocking with Sandy Bridge. Also, save a bit of money by getting the CL9 version as the lower timings make almost no difference. DDR3-1600 is Sandy Bridge's sweet spot.
I suggest one of these two memory kits:
G.Skill Ripjaws X 8GB (2x4GB) DDR3-1600 CL9
Corsair Vengeance 8GB (2x4GB) DDR3-1600 CL9