I am a "switcher" and I have my new Mac Pro for 3 days. Awesome!!!! I ordered 4x 1TB Hitachi and now I want to re-install Leopard. I will install RAID 01, so I will have 2 TB of space. What is the optimal space for system -, user files-, swapfile / pagefile-, time machine - partition. You see I have no clue, because I am a switcher.