The best replacement for 5870 crossfire is 5970.

The best alternatives to 5870 crossfire are rated as following:
★★★★★  5970
★  gtx 480 sli
★  6870 crossfire

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Speaking about 5870 crossfire, one probably shouldn't forget about 5850.

Other search terms related to 5870 crossfire and their ratings are:
★★★★★ 5850
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5870 crossfire
5970
gtx 480 sli