Asus MB I have had good luck with them. I also like Aopen thats what all my working computers are now.
I tend to like the 64 bit AMD processors jsut for the fact they will run both 32 and 64 bit code. A little future proofing in this transitional period.
Vidoe card Hmmm! If I went with a Matrox HD system I would use the parhelea with component out. If I went with a VT4 that has component out on the board then I would go with the latest Nvidea card.
Ram 4 Gig minimum fastest I could find.
HD space for video ultra scsi 640 ( ? ) Raid 1Terabit at least. System SATA150 or faster 100 Gig, and for audio SATA 150 200Gig.
Monitor (2) 19" LCD at 12ms refresh rate. and 40" Plazma HD video monitor.
Yamaha THX theater sound system connected to some really good sound card. with Bose speakers.
Input devices Wacom 20" video tablet, flat bed scanner from epson, opitical mouse, keyboard with custom markings for what ever editing system I use.
And just to be flashy lights lots of lights and clear pannels on the case.