Hey Mac Fans!!! I was thinking about purchasing an older Mac Mini either the one with the Nvidia's 9400m GPU or the Nvidia's 320m GPU they both have the superdrive in them. Which one would be more energy efficient??? What I mean by this is which one would use lesser power? I only need the Mac Mini for basic internet browsing, watching videos some HD playback, and office. Nothing more major than that. If anyone knows any difference between the two and has any advice on which would be the better purchase for me to make please post below; Model #'s: MC238LL/A, MC239LL/A, and MC270LL/A. Thank you everyone.