I need a computer for the summer for work I'll need to get done after selling my PC in expectation of Haswell MacBook Pros on Monday - which didn't happen. So I'm now considering just pulling the trigger and going with a current generation 15" rMBP and hoping I get a Samsung panel. I need the computer for general browsing and iTunes but also for my photography college work/hobby. I only use Lightroom and rarely go above 4GB of RAM used. Will choosing 8GB of RAM be okay instead of spending more for 16GB which could be unnecessary? Would this also be an area where AppNap would come in handy if I was running tight on RAM, AppNap would free up RAM with anything else the Mac was doing to make sure Lightroom wouldn't struggle for RAM?