I'm in need of opinions about different MacPro configurations from more experienced users than I am. I'm a university student and I mainly use my computer for running things like Word, Itunes, internet, watching HD videos/internet movies (often all at once). I don't game (anymore), but would like my computer to handle games just in case; think games like WoW. Also, I would like a computer that doesn't grow old in a couple years - I'm fine with updating things like the Hard Drive and RAM, however. So here are the two base configurations I'm deciding between: http://store.apple.com/us/configure/MD101LL/A or http://store.apple.com/us/configure/MD103LL/A and this also crossed my mind as an option: http://store.apple.com/us/configure/MD102LL/A Will the 2nd GPU on the 15'' make that large of a difference than say the 2.9 GHz Dual Core i7 with the intel HD 4000 GPU? And which applications will I really notice this? Also, if the decision comes down to the 13'' 2.9 GHz Dual Core, 8 GB RAM vs. the 15'' 2.3 GHz Quad Core, 4 GB RAM, with the 2nd GPU, which is a better decision for the money spent? Is the 2.3 GHz Quad better than the 2.9 GHz Dual in a general - does more than the average person - computer? Thanks in advanced for the helpful replies!