Dane,
You're currently using RCAs, right? Your system may be very quiet now, but you really should try the XLRs. It may be one of those instances where you realize how much quieter it can be.
XLRs also have the advantage over RCAs if the wire is long. Not sure about the scientific specs of length vs noise, etc. I'm also under the assumption that XLRs don't suffer from ground loop problems. I read/heard somewhere that every RCA has a ground loop problem, but at varying degrees.