Bought a 13-inch rMBP ($1499 model) from Best Buy on October 25 for $1349.99. The 15-inch rMBP is $1699 (including $50 off education) + I have an extra $35 reward certificate from Best Buy = $1664+tax. Is it worth spending and extra $315 for a 15-inch/Quad-core rMBP? I'm currently a graphic design major and looking into this offer, I still qualify for a return/exchange since I'm still under the 45 days Elite Plus.