Monitoring Speakers For Video, What speakers work with computer Options

[sconover]

What would be a good monitoring speaker for use in moitoring audio output from my computer (Mac Twin 1.25mhz G4)? I am a video editor that is looking to get better (more accurate) sound reproduction. Most likely I would be interested in nearfield speakers. Do you have to have a special card installed to hook up the speakers to the computer, or just run them through the sound jack in the computer?
Thanks!