Hey all,
Try before you buy, then buy what you like! Microphone choice is subjective, so there really is no right or wrong. If possible, go to a music store with a good selection of microphones, and play as many as possible.:toothy10:
I've been a sax player for about 20 years and a professional sound tech for about 8 years. I've done mostly live audio, but also some freelance studio work. That being said, here are my thoughts on all the microphones mentioned in this thread with which I have had personal experience.
NT-2: Large diaphragm condenser, mostly transparent response with a little extra warmth. Due to diaphragm size, this mic will not take high SPL (sound pressure level, i.e. loud sounds). Will pick up everything in the room, including breathing key noise, stage noise, etc. May be okay at 24-36 inches in the studio, but in a live environment, forget it!
KM-184: Small/medium diaphragm condenser, full range response, will catch most details, including breath and key noise. Certainly very accurate of the bunch, but that may not be what you want. Also, it may be a little bright.
C-1000: Small diaphragm condenser, good response, low freq. roll off. Comes with pattern adapter to go from cardiod (mildly directional, like an SM58) to supercardiod (more directional). Will take high SPL, I've used it on guitar amps and saxes alike. Warm sound, great live, decent in the studio. For less than $500 USD, this is one of my favorites.
SM57: Dynamic mic, has a bit of a upper mid-range bump in response. Takes high SPL very well, rejects off-axis noise best of those listed here. A good choice for live performance when budget is a consideration.
SM58: Dynamic mic, also has an upper mid-range bump, but SLIGHTLY less so than the SM57. Takes high SPL very well, but picks up a fair amount of off-axis noise. Definitely a vocal mic, definitely NOT an instrument mic, especially for sax.
:argue: SM57 vs. SM58 - Yes they are manufactured with the same transducer element. Yes, you can interchange the windscreens. NO they don't basically sound the same! Besides changing the pickup pattern, the windscreens have significant impact on frequency response and color of tone. Both microphones are industry standards, but please remember that this is mostly because they were affordable and durable about 15-20 years before anyone else made an affordable mic that could take a beating.