Yes if you are not overclocking go with the 1333. Since the memory controller is integrated on older core series chips as you up the multiplier/FSB/BCLK you will also be overclocking the RAM. Most AMD over-clockers are very familiar with this. Buying RAM with higher clock rate gives you head room when increasing the Multiplier so you won't have to them lower the speed on the RAM as you overclock to keep your system stable. With the new Generation of Sandy Bridge processors this is no longer the case, the memory and CPU clocks are controlled independently. Just get the 1333 if you are not overclocking because it will certainly lower the clock rate on anything faster to 1333 anyway.
EDIT: On the K series chip the memory clock and cpu clocks can be controlled independently and the memory speed will not increase with the FSB. From Clunk:
Things have changed somewhat, regarding memory on Sandy Bridge. On previous platforms, when you increased the BCLK/FSB, you would automatically increase the memory frequency, so the chances were, that you'd either be under or over the rated speed for your modules.
Because the BCLK is "fixed" to 100MHz, the memory frequency that you choose in the BIOS, will stay the same, regardless of the overclock that you end up with (Unless you have a locked CPU, more on this later), and this is because you have adjusted the CPU's multiplier, instead of the BCLK, this should all become less confusing as we progress through the guide, but in short, Sandy Bridge offers the following memory frequencies which are selectable, regardless of the CPU speed, but be aware that selecting the top two whilst running the CPU very fast, will require some extra tweaking, and we will look at that in a separate article or add on to this guide
Again the above only applies to K series chips for non K series chips Toms hardware has some great info:
If you don’t buy a K-series chip and instead grab a Core i7-2600, Core i5-2500, -2400, or -2300 (along with a P67-based motherboard), you’ll still have access to “limited unlocking.” This basically means you can set clock rates up to four speed bins above the highest Turbo Boost frequency setting available at any given level of processor activity.
So, take a Core i7-2600 as an example. The chip’s base clock is 3.3 GHz. With four cores active, it gets one bin worth of additional performance—3.4 GHz. Four bins above that would be 3.8 GHz. With two cores active, Turbo Boost bumps it up two bins, to 3.5 GHz. Limited overclocking makes 3.9 GHz available in that case. In a best-case scenario, only one core is active. Turbo Boost adds four bins of frequency, yielding 3.7 GHz, and Intel’s overclocking scheme lets you run at up to 4.1 GHz.