Hello, I've been reading several threads by the user-base here and thought that I might benefit from the knowledge of people on this forum. Thanks for reading. After doing some research, I've found that there are 3 main differences between the current MBP 15" vs. MBP 17": - screen size - Express Card slot on 17" (not on 15") - 8-hour battery on 17" (7-hour batt on 15") If there are other differences, please post them, too. My usage of the laptop will be for 3D Animation (Maya) and Music Production/Live Performance using Ableton Live and Serato. I am a beginner in music production, but I am serious about learning (been DJ'ing for over 12 years) and would like to "future-proof" my computer as much as I can. My main question is: for music production, is the Express Card slot very necessary? I'm not up-and-up on the hardware-side of music production, so I don't know if there is many Express Card gear available (and would I need to use them?). I can see myself using Ableton Live and Logic in the future... do I need Express Card? I'm leaning towards the 15" for its portability, but if it's really a good option, I could go with the 17" for its Express Card capability. Thanks very much for any input.