I am getting ready to purchase a G55 series from xoticpc, custom out with a 3rd Generation Intel® Ivy Bridge Core™ i7-3920XM Extreme Edition cpu and I see that the G55 comes with the 660m graphics gpu. Xoticpc does not show an option to upgrade the gpu, I was just wandering if anyone knows if the 660m in this laptop is user upgradable, or should I go with the G75 that has the 670m in it. I am not worried about battery or heat just power, and since I am spending over 3 grand on this thing I want the specs to be still high end for at least 5 years. I really dont want a 17" but if it is that much of a difference then thats what I will do. I know this probably isnt possible but I would like it to be upgradable to a newer gpu if a better one comes out in a year or two, I think sager allows users to upgrade the gpu but I havnt found anything about the g55. So if anyone has any idea about this please help me. I am pretty new into this whole pc gaming world and am starting to really love it.