I am looking to buy one (maybe a matched pair?) primarily for recording acoustic instruments and wondered if you could help me understand the various polar plots that I have seen. For example AVENSON AUDIO STO-2 shows this plot (from Mercenary): http://store1.yimg.com/I/mercenary-audio_1804_16841278 Whereas a cheaper SE Electronics shows: http://www.seelectronics.com/web/cm_se1_gra.htm (NOTE: The first is Omni pattern, the second cardoid - I am pretty happy with the difference between these) What should a good plot look like? Thanks in advance. G.