Higher base clock speed, or lower ram timings?

Im planning on getting some DDR2 ram for my new system and I am unsure of which would be the better choice of ram to get.


1024Mb DDR2-667 Performance Series Dual Channel Kit (4-4-4-8) $297.00

1024Mb DDR2-533 Performance Series Dual Channel Kit (3-3-3-8) $260.00

would it be better to get the higher base clock speed even though it has higer timings, and try and lower the timings by increasing the voltage. or would it be better to get the lower timings, and increase the voltage without increasing the clock speed?

any input on voltage/clockspeed/fsb ect will be welcomed

I'd think that with such a big boost on the fsb compared to the slower memory, the higher fsb would be the way to go cash permitting.

what higher fsb are you talking about? i didnt give any fsb times :S