Anything beyond the 1600/1866mhz range isn't really going to effect the real world performance of things. But the difference between 11-11-11-28 and 9-9-9-24 can be. So I like decent timings. at a decent frequency. But the choice is ultimately yours. The happy medium these days is the 9-9-9-24@1600mhz however and those kits are pretty decently priced.