if you want a screaming system i'd go with z68 board, 2500k or 2600k CPU, 8 gb of ram, 120gb SSD SATA III, a 590 GTX, 1200 watt psu, and you can get a nice after market cooler / a small watercooling premade kit.
You should be able to get 4.5ghz easy OC on the 1155 cpu, the video card may seem like a bit much, but I always look toward the future. The 460s are good cards, as stated above, but 590 run almost as good as 2x 580s ($1100 worth of GPUs) for $750. It also leaves room for a 2nd 590 to be added in the future to do quad-sli for another boost of GPU power when you need it
You should be able to get all of what I just said for well within your budget, and run every game on max settings with max AA / AF for at least 2 years+. (And like I said, if 2 or 3 years down the road you find that you need more power, throw in another 590 which will be much cheaper then and you'll be ready to go) Basically it leaves a lot of room for upgrades. If you get 2x 460s, I suspect you wont be happy with it sooner, and when you go to upgrade you'll end up spending more.
Just my 2 cents.