Bands that use a variety of vocals

[Zephyrus]

The Kovenant - Cybertrash, Neon, Industrial Twilight

I prefer the vocal dynamism of Animatronic. SETI was mainly the gothic cleans.

 

[EmbraceTheDeath]

ackercocke

 

[NinjaGeek]

Tvangeste for the most awesome black metal vocals you will ever hear combined with clean female vocals.

Really kickass stuff

 

[Catastrophic]

Kekal - Mean Attraction, Voice From Heaven, Militia Christi, The Monsters Within

Seconded but if you have eternal hatred towards Christians, don't.

 

[Chairman Kaga]

Wintersun

 

[The_Quadfather]

Thurisaz utilize black metal shrieks, death metal growls, and clean vocals very effectively to create strong melodies and dynamics songs. Check out "Point of No Return" off their new CD Circadian Rhythm. Great stuff!

 

[CF87]

Looking for bands that use a wide range of vocal styles, by this I mean they

A) Mix harsh vocals with clean vocals roughly evenly, and preferably have male and female vocals.
Ex) Ne Obliviscares, The Project Hate MCMXCIX, uneXpect

Tristania. check out Ashes

 

[General Zaroff]

The Ocean - Aeolian

Had 7 vocalists perform on the album.

 

[waif]

Emperor

???

Black Dahlia Murder mix grunts and screams
Opeth mix grunts, screams, and clean
Orphaned Land mix mild grunts, clean vox, and narration
Bal-Sagoth mix screams and deep narration, although sometimes there is grunts

 

[Manic Ferocity]

Lord Gore

Gurge has a lot of "gurgle" variations if you can consider that diverse.

 

[challenge_everything]

Arcturus (but no doubt you know them already)

 

[ShredHeadJHJ]

Orphaned Land
Therion
Ayreon
Graveworm
Opeth

Not lotsa grunnnting there, but diverse vocals styles amongst them.