Building a video-editing machine?

[Freakin]

I'm usually building office-type workstations or gaming machines, and I have no idea what kind of specs DV machines need.

I need help with figuring out requirements and hardware. I know that a lot of HD space is needed, but how much is a lot?

What does proc need to be?

Ram?

Is there any acceleration done my GPUs in video editing (i think the answer is no).

So help me spec out a reasonable configuration. With how cheap HD space is I guess it would probably have at least 500GB of workspace. Do I do RAID0? 0+1?

Thanks,

Freakin