Yeah, no point in getting anything above 1600, even with heavy overclocking, otherwise 1333 will do.
I think a lot of people either don't know or don't remember they can always drop their memory divider. You don't have to have great RAM to handle a high Bclk. All you need is good enough RAM to be able to handle overclocking at the lowest RAM strap. Right now, if you have DDR3-1600, you can drop the strap all the way down to DDR3-800 and get the Bclk up to 266 MHz and overclock your CPU by 100% without running the RAM out of spec. Your CPU is going to be the limiting factor, not your RAM, unless you have slow RAM like DDR3-1066 and want to put a big OC on your CPU.