I'm looking building a machine with two of these: http://www.newegg.com/Product/Product.asp?Item=N82E16814150182 SLI'd. I'm sure i have enough power and the right motherboard. What I'm wondering is how much better is two gfx cards than one. Would it be a better deal to buy a really good one now, or get two of these? I'm planning on two gigs of ram, and a core 2 duo processor.