The best replacement for 960 grid is 1140.

The best alternatives to 960 grid are rated as following:
★★★★★  1140
★★★★  bootstrap
★★★  twitter bootstrap
★  978
★  blueprint css

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Speaking about 960 grid, one probably shouldn't forget about html5 boilerplate.

Other search terms related to 960 grid and their ratings are:
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Google Trends

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960 grid
1140
bootstrap