Hi. Recieved my MBP Retina the other day and have been backwards and forwards trying to decide the best resolution! This whole "best for retina" "scaled" stuff is a little confusing to stupid old me! Anyway, my question for you tech heads out there is: If I am running the "best for retina" resolution 1440x900, and I watch a 1080p movie full screen, what is the movie REALLY running at? 1080p or 900p? Also with apps like Aperture that are "retina optimized" does this mean that even in the best for retina resolution they are running at 2880x1800? If not, I am confused what actually runs at the native resolution? Cheers for any answers and help, and sorry if its a really stupis and obvious question!