Please check out the bandwidth throughput with each combination especially with 1066FSB and 1333FSB.
I repeat once again for the best bang for your buck at FSB of 1066 use PC2-8500 (DDR2-1066) memory. If you can afford the costlier processor running at 1333FSB you should go for PC3-10600 (DDR3-1333)
Intel Core 2 - Wikipedia, the free encyclopedia