Hello all, I know many of these threads pop up so I apologise if it's been covered, but I would just like some advice on buying a new rMBP. My main use will be for photo editing (Lightroom etc) off a gopro, some video edits as well as the usual Web browsing, music/movie downloading etc. I have a 4k tv which I'd like to connect to via the macbook, but I've seen mixed results in trying this depending on the system. Can the 13" perform at 60hz? I'm looking at the new 13" rMBP, 2.7 i5, possibly with 16gb RAM and at least 256gb storage. I understand the new 15" is also an option, but I don't want to spend the extra money if it's not needed. Is there major benefits in the dual core vs quad core for the tasks I wish to perform? Also how big of a deal is RAM? The 13" comes standard with 8gb but I've seen many people say it's wise to upgrade. Any advice and feedback will be appreciated.