We’re running multitrack audio for live shows ( pro touring application – 4 tracks to the house and click to the drummer) using Sonar, a PC notebook and an Edirol UA101. We’ve been on this system for about three years now @ roughly 70 shows per year, a new city for each date – mainly festivals and some club / theatre dates. No problems yet. Sonar can run video in sync with audio, so that might be your answer, although I couldn’t say what extra draw on the system the video footage would generate.
HTH
Andy