Building a new system next month. I've already decided on the following: AMD Opteron 180 Denmark ASUS A8N32 SLi OCZ 2GB PC3200 WD 74GB Raptor SB X-FI FPS SeaSonic S12 600w All this will be attached to a 37" 1920x1080 LCD HDTV via DVi. I haven't been able to decide on video. I want it fast for gaming, but my concern is blocking PCI slots and upgrade-ability. If I get two single slot cards in SLi I won't block any PCI slots but I have no upgrade path. If I get the 512 I will block one PCI slot and if I upgrade to two 512's in the future I will block my remaining PCI slot. (one being used by the sound card.) What do you guys think?