I am trying to decide which one would be best for me. If I don't need to spend the extra $$ on the 15" then I'd rather not. I do graphic design/web design but never games/movie editing/3d modeling. So can I get away with the 13" without discrete graphics then? How much faster is the base 15" than the base 13" really? I plan on keeping my cycle of upgrading my mac every 3 yrs. FYI: Right now i'm still rocking a mid-2010 13" mbp with 2.4ghz intel core 2 duo and geforce 320M 256 MB graphics. Just not cutting it anymore. Any help would be greatly appreciated guys... especially from designers with said MBPs.