I am waiting (and waiting and waiting) for the updated retina MBPs and will be doing a lot of HD video editing on it. I currently have a 2008 pre-unibody MBP and the thing is on its last legs... I've truly beaten the crap out of it over the years and it's ready to croak. I currently use a portable external Firewire 800 hard drive as a scratch drive and my question is this: can I edit video (using FCPX) right off of the internal SSD? I know that doing so is discouraged with hard drives, but I am wondering with SSDs being so much faster that it wouldn't be an issue. This would determine what size SSD I order... and I would love nothing more than the freedom to edit with no external drives connected. I haven't really been able to find an answer anywhere.