Well Rick, I finally heard back from my bluegrass "friend of a friend" and I think his all of his comments might be of interest to this discussion, so I quote them below. Like Barbara and Rich above, he uses Audio Technia mics, however he uses the Pro 37R model.

For the response below he was asked how they use one or two mics for their performances,

We do this with "two" Audio Technia Pro 37R . They are about the size of your thumb and cost about $140 each. We put one about the height of you chest and sing over the top of it ( if you sing too close into the mike you get breath pops) and locate the other one about waist height to get the instruments. We move this lower mike off to the mando and guitar side of the vocal mike and the banjo is on the other side ... as he cuts thru anything. We turn the monitors off most of the time ... or have the on very faintly at the most. The lead instruments move in closer on the solo and back out for rhythm ..chope etc. The base can be just about anywhere. The interaction between the player is more like practicing in you living room ... and it take some getting use too. This mike setup works for fiddles too. Just move in and out of the vocal til the main speakers are balanced with the rest of the band.