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A used HD7870 or GTX 580 would be excellent. I dunno if HD7870 would offer much advantage over the GTX 580 for future-proofing, in the way of VRAM. Ones got more VRAM, the latter has greater memory bandwidth. Not sure about these high-end cards, but if the GPU can't effectively access the extra VRAM (ie low memory bandwidth), it doesn't offer a huge difference in performance. Maybe try and find a new GTX 560 448SP card, like many have suggested already - with an OC, should reach territory somewhere between GTX 570 and GTX 580. Pratically the same core config as the older GTX 470 (just much faster).
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