Why would I go with 4 By 2's for RAM? theres no benefit from that. The 2 by 4's give a larger buffer per stick and allow for 16 total for future upgrades. I would go for the 560's but I guess you can flash the bios from the 6990's to them plus they are a little cheaper and im a fan of ATI. Is a 120MHz refresh rate better than 85? Ill take your PSU's into consideration tho... cant screw that up... thats the heart of my (or yours or anyone elses) system... thanks!