|"Didn't think it mattered this time"|
The CPU (& your intentions) are the determining factor on which RAM to get.
The E8500 is a 1333MHz FSB CPU so if you have no intentions of ever overclocking, all you need is DDR2-667. You can get higher rated RAM (DDR2-800, DDR2-1066, DDR2-1200, etc) as long as you understand that for best performance, it should be underclocked to DDR2-667 speed & kept at 1:1 ratio if/when you overclock.
I know this was explained to you in another thread.