I would like to get two HDDs for my Video Editing/Projects. I plan on using 1 for holding all the recordings I get off of FRAPs Screen Recorder and my Elgato Game Capture software. The 2nd HDD will hold all my renderings, edits in progress, and other projects. I'm also debating on whether i'll get another separate drive for games and downloads and misc. files. Which should I choose? The 3TB Seagate runs at 7200RPM and the 4TB runs at 5900RPM. Is speed the key? Or is storage more important?