Im getting 2 GTX 570 considering the amount of the heat they would generate would this case be enough for a safe OC of these babies?? and what about the Antec 300 or the CM 690 II? also none of these have 3.0 usb ports, does anyone knows of a cage that has suports 3.0 usb and is 60$ top? I know is a very tigh budget but any suggestion is appreciate