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Depending on what you'll be able to find either a 5770, or a 6850? I'd personally go for an Asus or XFX 6850 with the enhanced coolers. Hell, you may find you want to sell your 5870 and crossfire 6850s, OC'ed as 6000 CF scales better than 5000 CF.
I would sell it, but I don't want to sell a faulty card.