I have recently gotten the opportunity to purchase a Mac computer with a discount. I will be using it for grad school work as a music composition/theory major, so I need it for Logic Pro X, Finale, and other music programs. I have narrowed it down between the 21" iMac (3.5ghz quad core CPU, 8gb RAM, 1TB hard drive) and the retina 13" MBP (2.6ghz dual core CPU, 8gb RAM, 256GB SSD). I love that the MacBook is portable, has the retina screen, and uses solid state memory, but the iMac gives me much more bang for the buck with the quad core CPU and 1TB of storage. Any advice from fellow Logic users? I really wish I could get the 15" MBP (2ghz quad core CPU, 16gb RAM, 256gb SSD) but it's simply too much money.