We could theoretically get three PC setups going, if we have enough controllers. My PC setup has my main PC on a 20" and 24" monitor, one of which could be connected to someone's laptop for a second station. My main gaming TV (42" LCD) also has a VGA hookup on it, so we can hook up a second laptop there as a main PC station as well (will be good for spectating finals, etc.)
The 24" monitor for the PC setup is actually an HDTV, so if there's need for a second station for other consoles for the tournament it can be used for that, although we'll need an additional console to hook up to it.