I'm an iPod, iMac, iPhone, iPad owner -- taking the plunge at work and want to replace my PC for an every day rMBP. I have a few questions - I'm not a super user by any stretch with the non portable devices (iMac, MacBook Pro, etc..). I will be using this 70% for work but will want to take advantage of the iCloud functionality (music streaming, want to learn how to do some light video editing in iMovie). Predominantly will be used for Microsoft Office 2011 apps. Questions: 1) How much of a difference is there in speed between the 13" dual core 2.4 GHz and the 15" quad core 2.0 GHz? 2) Should 256GB of storage be enough for saving a LOT of word/excel docs and only moderate music/pictures OR should I splurge on the 512GB? Money isn't a HUGE objective but if the $1,499 13" machine covers everything I need there's no sense in paying another $500+. PS - I've read this forum a lot over the years and appreciate all of the info i've received. I just 'registered' and this is my first post. Thanks!