From Newegg, it is around 3600$ with the two video cards in SLI. I may buy one video card only and add the second one later so I'd save $500. Good point with the raid. I will test the system with the mobo raid and if it is too slow I will go for a card, but I have no idea what card to get. -- "If at first the idea is not absurd, then there is no hope for it" Albert Einstein.
