Need some assistance making a simple, but important, decision. Do I go with the 8GB or 16GB memory? Here's some information about my computer usage... I don't do use any Pro-like apps (no video editing or things of that sort). Despite the above, I am a heavy computer user and am opening 50MB spreadsheets all day (which doesn't sound like a lot but they do take time to load and time to manipulate all that data). I currently use a late 2012 MacBook Pro (which is what the new MacBook Air is replacing). This is both my work and personal laptop. Any thoughts, questions or feedback? I realize it's a small request for assistance but any and all replies are appreciated. Cheers.