That'd be a pretty high end gaming rig. It wouldn't compete with some of the crazy stuff out there like an overclocked 4770k and 2 780ti's in SLI, but that's also a $3,000+ pc
You can always play with the 260 and see how it suits you, and swap the GPU out later. Maybe wait for the Maxwell GPUs to come out a little later this year.
You're never going to get a laptop with similar performance at anywhere NEAR the price of a desktop PC.