As far as I can tell. There aren't any laptops on the market that currently have a 680m in SLI, or 7870m in Crossfire-mode.
Since you're willing to get such a high performance laptop. I would recommend taking a look at Falcon-Northwest products. The DRX laptops have desktop grade components. Though, they do not offer Nvidia's 600 series chips, or AMD GPUs.
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