this might be of use to you. it's from a Course Reader at my school.
http://arts.ucsc.edu/EMS/Music/tech_bac ... es_20.html
Suggestions Wanted: Inexpensive General Purpose Mic
12I found a Beyer M201 on eBay for $150.00. The Sennheiser e609 is great for guitar, and you can buy them new for $100.00.