Read the DYI4 and am seriously considering building the Dual Dual you have listed but I have a few questions (concerning performance - not cost):
1) Is there any benefit of getting the Crossfire version of the ATI card?
2) The system drive (Hatachi 250) you have listed is IDE Ultra or SATA?
3) Any noticable benefit of going with 4gb memory over 2gb (I will be editing HD).
4) The ATI site stated it is preferable to have 450+ watts for the card, but the case is 425 watts. Should I get a bigger power supply?