Hi, I'm looking to buy a new macbook pro and this would be my first mac for a very long time and I have sadly been on PC for the last 10 years. I was wondering for the 2011 MBP what the difference between the 13" model and the 15" model is? I know the 15" has the quad-core and the 13" only has the dual-core. Does that make a huge difference in speed? And then in the 15" model the graphics are a little better, but what I'm going to use for it will be word,excel,powerpoints, an occasional video game, and maybe making some videos in imovie. I just think the 15" is too big and not really a good laptop to take on the road..maybe Im wrong, but I would love some feedback from people on what they think of the new 13 and 15 inch models in 2011. I would really appreciate it. Thanks.