Total beginner looking for mic for field recordings

Hi all. I have an M-audio microtrack. I am wanting to record mainly shakuhachi (Japanese bamboo flute) in the field, such as maybe nice reverberous caves? And maybe also sometimes nice local singers if I get the chance, probably in the open countryside. So do you have recommendatinos for a mic? I get the impression the included stereo mic with the microtrack is not so good. I have been looking (just online) at the following mics:
M-Audio Pulsar
AKG C1000S
Sony ECM-MS957
Sony ECMMS907

For some reason the m-audio one seems the most appealing to me. Maybe just because it is shiny? But it seems to have good reviews. Anyway I have never owned a mic except one I got for my MD player in China for about 10 dollars! So I thought you guys may know what is good or have recommendations.
Thank you in advance
Justin

P.S. I am really looking for spending not more than 200 US dollars