I did some researches on the MBs, and you should get the Z87-OC.
Because i7-4770K can be OC to 5.0GHz with low voltage, and there are 4 X PCI-EXpress x16 lanes even most of us don't use more than 2. Also don't count on the reviews from newegg's user. If you buy from newegg.com, you only pay $10 more.
I add one of them review, you can find more. http://www.eteknix.com/gigabyte-z87x-oc-z87-motherboard-review/