For the people contemplating it... Just thought I'd chime in on my base 13" MBP. Seriously, this thing is awesome. Atm, I have 8 tabs open in safari, iTunes playing music A movie encoding in handbrake A dvd ripping in mactheripper About 10GB movies transferring from my old external HHD to my new one.... Has external monitor plugged in, magic mouse, bluetooth keyboard, audio and the two external HDD's mentioned. AND it still hasn't shown any signs of lagging whatsoever. I also added watching a movie in Plex whilst performing the above and there was no choppiness at all. This thing is a great computer, really. Just out of interest - what would the i5's and above be useful for? Are they better for photo/video/music editing?