If you absolutely want the fastest memory, you seriously have to check out OCZ's 4800 Platinum Elite. However, think about the hole that these modules will rip into your pocket. Personally, I wouldn't spend that much money for memory, the added performance for the price is too small in my opinion.
It is great that the sticks are able to run either CL2 or CL2.5, at a higher voltage, without losing your warranty. And in case something goes wrong you still have OCZ's excellent technical support to help you out.