Alienware M15x vs. M11x for University?

I am heading off to uni soon and i want to get a portable computer which is good for gaming, im set on an alienware as i own the aurora alx and i love it. What would be better in my situation? One day I'm leaning towards the M11x the other im leaning towards the M15x. The portability seems brilliant on the m11x and i dont need something too powerful cause of the ALX i already own and the battery life seems brill, but on the other hand, the m15x is larger and has a better webcam/resolution/CD drive. But idunno if i want to lug it around all day on campus. Thoughts?