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Dual HD5670s should be an interesting choice and I wouldn't be surprised if the crossfire setup turns out faster than a HD5770 in some situations, because of the higher combined bandwidth.
I say get the second HD5670 and have fun overclocking them to oblivion.
You should be able to do ~850MHz core and ~1050MHz memory without a sweat (through CCC) -> at these speeds it should come very close to a single HD5770 @ default speeds.
Just make sure you get a GDDR5 version.
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