460's would be a good choice. They compare to a 580 when in SLI. Plus you can pick them up for around $100 each which makes it a great bang for the buck.
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Gamer: I5 2500K @ 4.5 - Gigabyte Z68X-UD4-B3 - XFX 6950 1GB @ 1000 / 1500 - Corsair Vengeance 8GB DDR3 1600 - Adata 64GB SSD - 2x 750GB WD Black RAID 0, Cooler Master 700w - Cooler Master HAF 932 Advance - 23" Acer 1080p - Win7
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