I second just about every band in this thread (especially Opeth) and add myself:
36 Crazyfists
40 Below Summer
Adema
American Head Charge
As Cities Burn
Avenged Sevenfold (only their latest album City Of Evil though)
Boysetsfire
Bullet For My Valentine
Children Of Bodom
Dead Poetic
It Dies Today
Disturbed
Every Time I Die
Finch
Five Pointe O
Glassjaw
Helmet
Clutch
Ill Nino
In Flames
Machine Head
Mastodon (*drool*)
Mudvayne
Nine Inch Nails
Nora
Planes Mistaken For Stars
Poison The Well
Sikth
Slayer
Static-X
Spineshank
Stabbing Westward
Soulfly
Stone Sour
Still Remains
Team Sleep (if you like Deftones; it's Chino's side project.)
The Dillinger Escape Plan
Theory Of A Deadman
Thrice (latest album only)
Thumbscrew
Dream Theater (erm....if you don't get Train of Thought, you are STUPID
)
Buckethead
Bleed The Dream
Crossfade
Curlupanddie
Demon Hunter
Hoods
Secret Lives Of The Freemasons
Roadrunner All-stars CD (it's a collaboration with a lot of the Roadrunner artists)
The Acacia Strain
The Red Chord
Oh and check out the roadrunner website, nearly all the artists on that label are good.
And before anyone questions my choices
I based them on both "metal bands", and the bands he listed (which certainly aren't all metal
)
That's about all at the moment, enjoy!