I got a 16GB 13" rMBP model, and I only have ~3GB left usable (as I'm typing this). I only have iTunes playing music and Safari open, in its last minutes of a download. It seems that Safari is the main RAM hog, but almost 6GB? Is this normal? Or is there something wrong... Seems VERY extreme. PS, I just restarted about an hour ago and these have been the only apps I've been running.