Im a graphic design student about to graduate and looking to upgrade from my little 2GB Ram Macbook. I already know i'm going to be getting the 15" anti glare screen. I'm planning on getting 8GB of ram, but my question is will I really notice the difference between the AMD Radeon HD 6490M and the AMD Radeon HD 6750M? Also same question for the 2.0GHz quad-core and the 2.2GHz quad-core?