I guess it depends on how much you are getting the laptop for. The specifications are okay, around the middle tier I guess. Depending on your budget you could get more for your money. As far as being able to max out LoL at 60 FPS, I wouldn't be sure. But I do know that the game is not particularly intensive, and at that resolution, I wouldn't be surprised if the HD 8750M could max it out.
If it's DDR5 version, 8750M could be a little better than GT 640M DDR3 but since it's DDR3 the performance should be quite a bit better than GT 635M or HD 7670M but slightly below GT 640M. So it sounds like a good deal at this priceline.