I'm curious to know what would be a great mic in the 2-400$ range for metal and rock vocals.

However I also came across something concerning dynamics being top notch for the metal vocalist that are quiet singers (vocals damn near to whispering volume)

Are there any vocalist that would like to chime in regarding this style of vocal, and the mics?
for anything under constant screaming, a condenser will most likely be the way to go. i'm personally a big fan of the Bluebirds, but you could get an AT4040 or 4033 that would do quite well too. if you plan on singing/screaming extra loud, look for a mic with a pad (AT4040 has one)

it really depends on the voice. some singers use dynamics in the studio, but the vast majority of vocalists of all styles will use a condenser.