EVGA GeForce GTX 780 Superclocked Video Card - 3GB GDDR5, PCI-Express 3.0
$719.99 - $170 - $30 (coupon) - $20 (rebate) = $499.99

coupon code: CFH124288 (exp. 6/30/2014).
Shipping is about $9, free 2 day shipping if you have Shoprunner.

EVGA GeForce GTX 780 Superclocked Video Card - 3GB GDDR5, PCI-Express 3.0 (x16), 1x Dual-Link DVI-D, 1x Dual-Link DVI-I, 1x DisplayPort, 1x HDMI, DirectX 12, Dual-Slot, ACX Cooler - 03G-P4-2784-KR at TigerDirect.com