Depending on your venue and distances, have you looked at Eartech? I have a ClearCom / Production Intercom for my blackbox theatre, but for "bring-your-own-venue" stuff I have a four headset Eartech system that has treated me pretty well. Wireless solutions still give me the heebee jeebees and my blood pressure is more consistent with the wired system, but in the budget constrained high school community, this system is gaining a fair bit of traction. Once you get your wired system operating again, you can also by a component to add the wireless headsets to your wired system.