PowerNotebooks is good place, no Xotic but still good. Optimus switches from the discrete GPU to the on board when graphics demand is low, and vice versa. See if you can manually set to onboard and tell me how much battery life you get.
That is the model I am looking at in a 15.6. It will game some even though not a gamer per se. Weighs over a pound less and $400 cheaper than the NP8150