Hey everybody. I want to improve my mic closet. Since my only dynamic mics are a 57 and a 602, one of the above three mics is probably a safe bet. These 3 all are large diaphram dynamics that seemt to be used in very similar roles: vocals, guitar amps, kick drums (at least the 421 and the RE20 get used there), bass amps, snare (at least the 421 seems to get used there), sax (at least the RE 20 and SM 7b seem to get placed there by some people). But the RE 20 is almost twice the price of the 421, with the SM 7b sitting between them. Can anyone give me insight into why they're so different in price, or which is the better mic. Also, which could get used most often for vocals? Thanks.