Re: My school project: Linux multimedia production workstation
Best bet, if it MUST remain stable, install 7.10 rather than 8.04. In two or three months most of the major upgrades to 8.04 will likely be done, and it will be a more stable system, either that or use Slackware.
As for hardware, look up all the things for really good gaming. The newest nVidia's are nice, but check to make sure they will run fill tilt with the drivers Ubuntu has or the latest beta drivers from nVidia. I recommend, if you have the money, getting a single small SSD for the OS and use the raid array for storage. It would improve opening times of the big multimedia apps.
P.S. Don't forget to show off the cube! Even if it is not practical, it looks darn cool.
The angels have the phone box!