I'm about to start my first year of college, and I plan to study graphic design. I've been needing a new computer for a while now, and I've been looking at refurbs. My question is, does the 17" superior screen resolution and longer battery life justify the higher price? Or is the 1400 x 900 resolution good enough? I plan on buying a HyperMac External Battery somewhere down the line. Here's a link to the two models i have my eye on: 15": http://store.apple.com/us-hed/product/FC026LL/A?mco=MjE0NjE5MA 17": http://store.apple.com/us-hed/product/FB604LL/A?mco=MjE0NjE5MA Thanks for all the help!