Hey guys so I am buying a used MBP with optical bay on ebay but wanted to know is there such a huge difference between the 2.6 model and 2.7 since there is such a huge price difference? I know the the cache bumps up from 6 to 8MB but is there really enough of a difference? I am looking at a 2.6 with regular screen for $1,299 and a 2.7 with Hi-Res Anti-glare for $1,975. My major uses are Photoshop Lightroom and iMovie. Reason I am not going for retina is because I use optical drive for data doubler and I have my Home folder on 2nd drive. Thank you in advanced.