Hi I'm looking to buy a macbook pro (non retina) primarily for sound editing but with option of video editing. Looking at the options on the mac website it appears the only benefits of the 15" over the 13" is the quad core and the screen size. Are these really worth the extra $300? In about everything else the 13" seems to have better specs. If anyone has an opinion on this matter as to which one would better serve my needs it would be much appreciated! Here are the two I'm looking at: 13-inch: 2.9GHz 2.9GHz dual-core Intel Core i7 Turbo Boost up to 3.6GHz 8GB 1600MHz memory 750GB 5400-rpm hard drive1 Intel HD Graphics 4000 Built-in battery (7 hours)2 In Stock Free Shipping A$ 1,689.00 15-inch: 2.3GHz 2.3GHz quad-core Intel Core i7 Turbo Boost up to 3.3GHz 4GB 1600MHz memory 500GB 5400-rpm hard drive1 Intel HD Graphics 4000 NVIDIA GeForce GT 650M with 512MB of GDDR5 memory Built-in battery (7 hours)2 In Stock Free Shipping A$ 1,999.00 Thanks!