Memory for new 4670k build

Skarn

Honorable
Oct 16, 2013
7
0
10,510
So here are my candidates, I don't really know the differences between them,
Motherboard I was thinking of a Gigabyte Ga-z87x-ud3h which here in the forums i have read lots good reviews.

G.skill Tridentx Ddr3 2133 Pc3-17000 16gb 2x8gb Cl9 (1.6V) (am I capped at 1.5 without OC?)
or
G.skill Sniper Ddr3 1866 Pc3-14900 16gb 2x8gb Cl9 (1.5V)
or
Ripjaws X which can be either 1866 or 2133

I wasn't planning on OC from day 1, but sure in the future.
Thank you!