Not to derail, but what's your work flow? I have a P3P and haven't don't much video editing. I tried dragging a video into premier but on my Retina MBP it barely plays and it looks like it's only "imported" at 1080p. The original files play decently in Quick Time though.
Also, I realize the laptop probably isn't the best option. I do have a desktop that has quite a bit more power I could use...once I buy a new mobo the fix the current one that's apparently crashed.