At 1600Mhz speed the ram provides more bandwidth for your system. At 1333Mhz speed as o1die as mentioned - it will get your information to you quicker, but less bandwidth.
You might want to try it at 1333Mhz speed, and at 1600Mhz speed to see which you like better - you can also try out a game with FRAPS.
IMO i think you will get better performance out of 1333Mhz (due to lower timings) as I can't see your system using tons of bandwidth due to your setup.
Thanks to both of you. I will give that a shot. My OCD kicking in was an issue with wanting those numbers to match rather than perform, haha. I will give them a days try each and see which fits better.