I have taken the plunge as a freelance graphic designer and need to purchase a new laptop. I am planning on buying a 15" MacBookPro, along with an inexpensive larger monitor for my office. Is there a big difference in the Intel Core i5 and i7 that would be necessary for me? Also - with regard to the grpahics card, is the NVIDIA GeForce GT 330M with 256MB ok for my use, or would the 512MB be necessary? I am thinking that 256 is fine for my purposes, but I am not sure. Should I increase the memory to 8GB rather than 4GB? I would likely be running Photoshop, Illustrator and InDesign simultaneously. Thank you!