[Organizers] Better quality microphone

Regarding microphones for use by the Caller (not by the band), do you have a particular brand and model that you think is superior for use by a caller? Our group (Queen City Contras, Burlington, Vermont) does not own sound equipment, so we are at the mercy of the the equipment provided by the band (or sometimes a small-time, local provider).  Often it is quite difficult to hear the caller during a dance, and I have experienced the same problem in many other halls, with many other sound systems (even some very expensive systems).  The calling needs to be intelligible, not acoustically accurate.  I know that there are many contributing factors, but I suspect that often the microphone is a big part of the problem. Do you supply a microphone for the caller?  Do you have a particular brand and model that you think is superior for use by a dance caller? Thanks, -Brian Appleberry Queen City Contras Frozen in Vermont