I've been running two EVGA GTX 480's in SLI (don't laugh) for the last couple of years, and I'm now looking to run a single card solution. My question: 1) What nVidia single card solution would exactly match (or come close to power/performance) when benchmarked against two stock GTX 480's in SLI? Is it a 7-series videocard? A 6-series? Something else? The GTX 480's in question are 015-P3-1480-AR.