I currently have a base model MacBook Air from 2010. It stutters quite a bit. I want to purchase a new Mac but don't really like how expensive the retina MBPs are because they aren't user upgradable. The bestbuy Black Friday ad shows they are selling the 2012 cMBP for $899. Is this a good deal? I will probably upgrade the ram and then maybe to an SSD next year if I purchase it. I mostly need it for browsing and papers. Thanks!