If I liked this kind of music mentioned, it would had saved me thousands of dollars, since to listen to these bands there are few requirements for a loudspeaker among which worth mentioning:
Big woofers
Hi power handling
8 ohms impedance
Hi quality drivers and cross-over parts not important.
To listen this kind of music I surely would buy a cheap pro-audio speaker with a 15'' woofer in a big Bass Reflex cabinet, without much definition or transparency to dont enhance the distortion guitars and screaming vocals, other option is a 2 x 12'' woofers + a horn for treble.