first off, why does an art institute have database classes
and why are you an artist and don't have a Mac? why in the world would you have a windows box?!?
Linux is pretty decent, but Mac OS X is where it's at for any sort of creative work. A/V work, print layout, digital photography, illustration.
All your apps run on it (if you have the last version of the apps, you can cross-upgrade.
Adobe Premiere?!?! They use that crap? Final Cut Pro is quickly becoming the standard. If not FCP, then Avid right now. Avid's not going anywhere, but they're certainly going to have to share the limelight with Final Cut. Premiere is a half-ass pretender. It's buggy, crash-prone, oh... and doesn't run on the dominant media-production platform anymore. Premiere is Windows only now. Good one Adobe, WAY TO GO YOU MORONS.
Oh well, it sucked ass anyway.
My suggestion to you would be to save up a little bit of doh, get yourself a used G4 (good ones can be had for $750 or so) and Mac OS X, cross-upgrade your apps and never look back.
Yeah, Linux is nice, but it's honestly even less well suited to the needs of an artist than is Windows