If you're using avid.. God help you..
If you're using Liquid 6 like everyone else you're going to want the following..
AMD 64 3200 Winchester 939
2x 6600 GT PCIE cards
2x 1GB ddr400 CL2
1x 80gb IDE drive (os)
1x 200GB 7200RPM **8MB CACHE** sata drive (source)
2x 36 or 74 gb raptor drives (render drives) .. You might also want to check into the 16mb cache maxtor drives, they were benchmarking the same as the raptors for me today.. the seek time on the raptors is lower but that doesnt matter for video editing.
should be like 1600 or 1700$ but you'll be amazed.
If you're using avid you're going to want a cheap dual xeon setup
I'd recommend a pair of 3.0s with 2gb of ecc 333 ram on a ncch-dl
same HD configuration.
I'm not sure how much video you're going to be spooling up at once but a 200gb sata would do it for most..
<-- this is where i work.. We're the Dell of pro-audio pro-video.