Recommend any metal group(s)

[Leah]

I just need some more metal groups in my life, here's what I got:
Firewind
Arch Enemy
The Agonist
Children of Bodom
Soilwork
Iron Maiden
some Metallica (...And Justice for All towards their earlier stuff)
Sirenia
Nightwish
Lacuna Coil
Megadeth
Avantasia
UnSun
Nevermore
Iced Earth
Draconian
Dream Evil
Samael
Nachtmystium
Sentenced
Ethereal
Graveworm
Dimmu Borgir
Within Temptation
In Flames
Xandria

As you can see, I mostly listen to stuff from Europe. Got any suggestions? Thanks!
one more thing: I either listen to the guitar riffs, the melody, or if the singer isn't screaming all the time, as in Nevermore, Metallica, Iron Maiden, etc. If it's stuff like Behemoth, I won't listen to it. other than that, I'll listen to it.

[Psycho Circus]

Based on what you like already, I'd give some of these artists a try. You may have (should of) heard of a few.  

Testament
Sanctuary
Fates Warning
Annihilator
Savatage
Chastain
Accept

[Jack]

Early Black Sabbath, Ozzy Osbourne (the Randy Rhoads albums are favorites of mine), I guess Led Zeppelin is usually considered heavy metal, though only a few of their songs really are.

Circus will probably have a suggestion or two  

Edit:  lol, he already did.

[Leah]

Chastain- 
Savatage- 
Testament- Older stuff  newer stuff 
Sanctuary- 
Annihilator and Accept- Mixed feelings

Led Zeppelin is great, but with my dad "singing", it just ruins it for me. Black Sabbath is great as well

[Psycho Circus]

Testament- Older stuff  newer stuff 

Aww dude, Testament's newer stuff has been good, at least "The Gathering" and "The Formation Of Damnation" -they were monstrous returns to form. I wasn't keen on "Low" or "Demonic" and some of their re-recordings, but they're still one of a number old school thrash bands out there putting new metal bands to shame.

Hearing this song live is still one of the greatest musical experiences of my life: 

http://www.youtube.com/watch?v=6iiFPsdL4NM

[lester1/2jr]

Fates Warning with the old singer.

[Psycho Circus]

Fates Warning with the old singer.

Yeah, John Arch ruled!

http://www.youtube.com/watch?v=VZ8nkl9tvBw

[lester1/2jr]

That album is ridiculous. Everyone should own it. Even those who don't want it.

[RCMerchant]

No Slayer? 

http://www.youtube.com/watch?v=D1bBGdoRgYU

No Nuclear Assault?

http://www.youtube.com/watch?v=E8siC5hBjnY&feature=related

No-gasp! Brutal Truth????

Napalm Death???

No SUICIDAL TENDENCIES????

http://www.youtube.com/watch?v=acpd7sn1Y6k

[HappyGilmore]

Anthrax
Killswitch Engage
MurderDolls
Lamb of God

[Allhallowsday]

I like the oldies... how 'bout the first Hardcore band BLUE CHEER? 

http://www.youtube.com/watch?v=aJ2efmwyUJA

http://www.youtube.com/watch?v=tjbDzwjoQwA

[Psycho Circus]

Annihilator and Accept- Mixed feelings

Bull, have you heard these tracks by Annihilator & Accept?

http://www.youtube.com/watch?v=DQp98s3xV-U

http://www.youtube.com/watch?v=1-YksCd1A3k&feature=related

[zombie no.one]

in my humble opinion 'Never Neverland' is the only Annihilator album anyone needs to hear. It is a masterpiece of metal...the rest don't really hold up. like I said,just my opinion

also Pantera needs a mention - any album from Cowboys From Hell onward. such a heavy sound they pioneered (or stole from Exhorder depending on who you believe)

[Pilgermann]

Not really similar to those listed, but I like Neurosis.

http://www.youtube.com/watch?v=GDn-8Rj7pAI

[Joe the Destroyer]

3 Inches of Blood
Mastodon
Evergrey
Throwdown
Parkway Drive
Thy Will Be Done
In Other Climes (very hard to find any material for... they're a small band from France, possibly even no longer together)
Gojira
Machinehead
Falconer
God Forbid
Hatesphere
Shadows Fall
The Agony Scene
Novembre
Chimaira
Corrosion of Conformity
Dark Tranquillity (name not misspelled; it actually has two L's)
Symphony X
Steel Attack
Onmyouza
Amon Amarth