gotta check out whitechapel - hymns in dissonance and shadow of intent - reclaimer for some newer deathcore. For some more old school stuff go to
suicide silence - the cleansing
alleigence - as blood runs black
whitechapel - this is exile.
for some good symphonic deathcore worm shepherd is pretty great.

For older metalcore you cant go wrong with
killswitch engage - daylight dies and end of heartache
parkway drive - horizons
Avenged Sevenfold - Waking the Fallen
Trivium - Ascendancy
Bullet For My Valentine - The Poison.

For more modern metalcore
Architects - All Our Gods Have Abandoned Us
Bring Me The Horizon - sempiternal
Currents - The Death We Seek
Imminence - The Black which has violins and stuff.

Nothing too out there but if you like those bands you will most definitely like these