I am working with someone else on a similar issue. Their board said 1600 (O.C.) on it and they put in 1600 RAM. It crashed every 4 hrs or so till he manually dialed the settings back to 1333. Then it started working stable.
If you get the RAM you are considering, you may have to play around with BIOS settings in the same way in order to get stable operations, either downclocking the RAM or upclocking the motherboard/processor if they are both capable of 1333 (which they may not be).
- Edit - www.Newegg.com should have 1066 RAM that will work. I would stick with Crucial or Kingston.