Hi Soft,
For your config you can consider getting RAMs that are at least 800mhz. Note that 1066 is not a standard config yet, but you can get RAM modules that are rated to 1066. Video rendering is highly stressful on the memory bandwidth component, which describes how fast information can be accessed from memory, thus having a faster RAM speed would help this process.
Do you really need a cpu cooler, most boxed intel sets come with a cpu cooler anyway, and most aftermarket ones are aimed at overclockers and stuff. If you arnt an overclocker, its best not to get those as they come with faster fans which create more noise.
For video, you could also consider RAID to speed up the hard drives. RAID is a system where multiple hard drives are linked to speed up or create data redunduncy. There are different levels of RAID ranging from 0 to 6. Do search online for more information on RAID, as its a little too technical to be explained here, but RAID does provide benefits for content creation workstations.
Im using a pretty similar core2 quad system here.