Replacing a 2011 15" rMBP used mostly for Lightroom photo editing and Final Cut X 4k video editing. Wondering what configuration will give me the best battery life. My 2011 barely gets 3 hours of life on battery. I don't mind spending money where its worthwhile. Will probably go with the 512GB SSD because I use Samsung portable SSD external drives for photo and video storage. Thanks for any suggestions.