Portable Audio Recording - The Zoom H4n

Recording samples is a necessary part of reviewing some of the world's best acoustic instruments.  For those situations when I can't get a certain instrument into the studio, I'm trying out the Zoom H4n.  The built-in stereo condenser microphones capture a respectable sound, but I selected the H4n for its combination of extreme portability, rugged build AND ability to record 4 tracks simultaneously through the use of it's balanced auxiliary inputs.  I'll be researching some microphone options for future audio samples over the following months.  Suggestions are more than welcome.