As mentioned in the topic, this will be purely for gaming. So is the performance worth the higher cost? In the end it's not much but why pay 20€~27$ extra for practically nothing? And what about the 1333 with CAS 7, instead of 1600 with CAS 9?
My rig will be:
CPU: Intel Core i5-2500K
GPU: Radeon HD 6950 DirectCu II, 2 GB
MOBO: Z68 Extreme3 Gen3
Yeah you basically see cas latency increase as speeds go up , so in your case option 3 would be the best performance * as long as those advertised speeds aren't overclocked..as oc'd your memory will lower its cas latency..usually by 1 for each bump up into the next bracket of speed.