Either a GTX 780 or a R9 290. And for the sake of simplicity, they both have stock coolers.
My friend said he'd rather go with an R9 290. I think he's wrong.
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Edited by Ad Hoc: 1/20/2014 8:24:03 PM290 has terrible cooling/overheating problems, and is overpriced because of Litecoin and Bitcoin miners. And dat 780 Titan cooler. HAVE MY CHILDREN.