Ram for new build help!

[Schoieuk]

Hi guys, just need a little help with some new ram. My build is a high end gaming pc that will be overclocked!

Atm i am un sure weather to go for Corsair Dominator 6GB (3x2GB) DDR3 PC3-14400C9 (1866MHz) Tri-Channel (TR3X6G1866C9DF) [TR3X6G1866C9DF]

http://www.overclockers.co.uk/showproduct.php?prodid=MY-165-CS

or:

OCZ Gold 6GB (3x2GB) DDR3 PC3-12800C8 (1600MHz) Tri-Channel (OCZ3G1600LV6GK) [OCZ3G1600LV6GK]

http://www.overclockers.co.uk/showproduct.php?prodid=MY-185-OC&groupid=701&catid=8&subcat=1389

x2 for a 12gb of ram set up.
will 12 gb of ram of cheaper ram work better? the corsair dominator has very good reveiws for overclocking, which is what i am going to be doing.

any suggestions?