G4 Audio Recording Options

[southernstones]

I am looking for a little basic information as I am beginning to set up my G4 Powerbook as a portable recording studio. Here are my parameters:

1) I want to record one stereo channel in very high quality. (I will be recording pipe organs in the Netherlands, for possible CD release).

2) I would like to use phantom mics, but am open to debate.

3) I would like to keep my equipment to a minimum so I am as mobile as possible.

4) no audio plug-ins or effects are needed.

I am thinking that I can probably use the installed GarageBand, but I have my doubts about my sound card. Do I need to upgrade? What external hardware do I need besides mics and a stand? (Remember I'm only recording one stereo channel).

Thanks for the help.