So I bought this late 2011 15" http://store.apple.com/us/product/FD318LL/A refurbished late 2011 last friday and just realized that I could have gotten this late 2011 15" refurbished http://store.apple.com/us/product/FC723LL/A with 1gb of GBU instead of an 512mb one. Difference is only $170 more! That being said I'm thinking about using this computer for the next at least 4 years and I know that GPU is not an user upgradable feature. Go for it or stay with the 521mb GPU one? I can still return this with full refund!