I'm about to pull the trigger on a refurbed 15" rMBP with the 2.6GHz and 512GB SSD. The price is so enticing at the $2379 mark. My question is: do you think 8GB of RAM will be enough? I do use Photoshop, LightRoom, InDesign, Premiere fairly often. The RAM issue is my only hesitation. I love the fact that I'd get much more space on the SSD for a few hundred bucks less. Thanks.