I'd suggest you go to archive.org and do a search for bluegrass acts such as Yonder, Hot Buttered Rum, and so forth, stream some shows and see how the various mics sound when taping that genre of live music, since you will often be the only taper at your shows you might also want the flexibility of interchangeable caps (cards in good sounding rooms, hypers in boomy or chatty rooms, omni's for outside and on stage placement), suggestions in your price range with interchangeable caps would include akg 480's, MBHO 603a, Neumann 140/50, Microtech Geffell 200