I would definitely NOT recommend putting a strobe into your lighting system. They give some people seisures, and make lots of others physically uncomfortable in other ways (they make me feel sick to my stomach, for example). We had one in our lighting system and got so many complaints that we eventually just took it out. Horrible invention.... If you do decide to get one, though, you can pick them up at Radio Shack for cheap.
But, to be productive, I can tell you that we have a rackmount lighting control rig that is sound sensitive. Takes up one rack space and hooks up to a controller box that the lights plug into. You can set which lights you want to be sound controlled, and you can also set the sensitivity and rate of the sound control. Works pretty well, but we use the buttons on the front of the rack unit to manually trigger the flash pots (the really bright lights) and a few others for effect, so that they don't just come on all the time.
Hope this helps,
Ryan