I second Ravi's recommendations on Patricia Barber. She has a new one coming out in the next month or two as well.
I would recommend also an instrumental jazz recording from Al DiMeola called 'Rite of Strings'. It all acoustic with Stanley Clark on bass and Jean-Luc Ponty on violin. Superb audio quality with very layered stereo imaging and depth. The music is tight and melodic. I have to listen to it at least once a week to get my fix