So the time has come that I bought a 5D Mark II and have begun editing a lot of HD footage, and my Mac Pro's current hard drive setup will not suffice. My current setup: Bay 1 = WD Raptor X 150GB 10,000RPM (OS, Final Cut Studio 2, Adobe CS3, etc) Bay 2 = Apple-supplied WD 320GB 7200RPM (Music/iPhoto libraries, small Windows partition) Bay 3 = Samsung Spinpoint 500GB 7200RPM (Media dump/scratch disk for editing, as well as my spillover Applications folder, etc) Bay 4 = Empty I'm looking to revamp this setup, as I'm struggling in many ways. First off, my main boot drive being the Raptor 10,000RPM was a dumb idea. Yes, it is faster, but I can't install the full OS X, FCS2, CS3 packages and my regular cornucopia of apps without leaving ~1-5GB free. I feel that this kills any speed gain because the drive is full to the brim, and for such a minimal speed increase I'm working with a very very low ceiling of free space. I'm considering ditching this and going with a bigger 7200rpm drive so I don't have to worry about running with a filled up drive again. Here's my idea. I was thinking of getting a 1 or 1.5TB 7200RPM drive to run the OS on and also store my footage, keep all my applications, downloads, etc. Then I could move my 150GB Raptor X out to bay 4 and make that my project scratch disk for video editing(not sure it'd be big enough for larger projects). And then if I had any money left, I would axe the 320 and put another 1TB in its place. Or I could save money and get that new nVidia card for the Mac Pro (I still have the stock HD2600). I boot windows and play games, but rarely. Would this upgraded video card help with video editing or rendering effects significantly enough to justify the ~$400 pricetag? Or should I save my money and buy camera equipment? More importantly, any recommendations for the quickest/most reliable 1-1.5TB drive out there? or should I avoid them? I don't want to spend a ton of money so I'm not looking to do expensive RAID setups or anything, i'm not editing uncompressed. Thanks, and sorry for the long post.