I've never used the KSM27, but the NT-1000 tends to get a little "bright" in the upper registers, so I'm not sure screaming metal vocals would be the very best app. for it.

Nary a condenser hath by man been forged evil enough to subdue the Screaming Vocal of Metal. Deny the twain and procure thyself a [[url=http://[/URL]="http://www.sweetwat…"]Beta 52[/]="http://www.sweetwat…"]Beta 52[/].