Just compared prices at CyberPowerPC.
http://www.cyberpowerpc.com/system/Mega_Special_IV/
I would add a dedicated 7200 RPM hard drive for DV and HDV editing; striped disk array storage (RAID 0) for HD. - recommended by Adobe
Get two Western Digital WD1001FALS Caviar Black Hard Drive 1TB and use them in a raid 0 configuration. Don't make this your boot drive. This raid 0 will deliver the best performance for video editing.
The Seagate Barracuda will die in about six month with heavy use so always back up.
Here is all the info you need about raid configuration from ASUS message board.
http://vip.asus.com/forum/view.aspx?...Language=en-us