off the top of my head: Coheed and cambria, pink floyd, nevermore.

here you go, a whole bunch of prog bands

Adagio (FR)
Adramelch
Aftermath
Age Of Silence
Aghora
Alarum
Alchemy X
All Too Human
Alogia
Anacrusis
Andromeda
Angra
Angtoria
Annon Vin
Archetype
Ark
Artension
Atrox
Attention Deficit
Behold … The Arctopus
The Beyond
Black Jester
Braindance
Calhoun Conquer
Canvas Solaris
Catharsis
Circus Maximus
Communic
Continuo Renacer
Control Denied
Crimson Glory
Cynic
Damn The Machine
Deadsoul Tribe
Defyance
Degree Absolute
Delian League
Depressive Age
Digital Ruin
Disillusion
Divercia
Donor
Dream Theater
Dysrhythmia
Edwin Dare
Elegy
End Amen
Ephel Duath
Ephemeral Sun
Event
Evergrey
Farmakon
Fates Warning
Fifth Season
Forte
Fountain Of Tears
Frantic Bleep
Freak Kitchen
Garden Wall
Golgotha (UK)
Gordian Knot
Gracepoint
Grayceon
Heads Or Tales
Heir Apparent
Hex
Hieronymus Bosch
Highest Plade
House Of Spirits
Imperium
Inner Strength
Ion Vein
Jester’s March
Kamelot
Kinetic Dissent
Kong
Labyrinth
Lethal
Lethargy
Leviathan
Linear Sphere
Loch Vostok
Lord Bane
Lost Century
Madsword
Manitou (NO)
Manitou (FI)
Maraya
Martyr (CA)
Mastermind
Mayadome
Mechanical Poet
Megace
Mekong Delta
Mercury Rising
Misanthrope
Mystic Force
Nightingale
Nueairea
Opposite Earth
O.S.I.
Osiris
Outworld
Pagan’s Mind
Pain Of Salvation
Parish
Planet X
Platitude
Poverty’s No Crime
Power Of Omens
Prototype
Psychotic Waltz
Pyramaze
Pyramid
Queensryche
The Quiet Room
Reading Zero
Realm
Red Tide
Redemption
Renaissance
Riverside
Savatage
Scholomance
Sea Of Dreams
Secrecy
Secret Sphere
Seer’s Tear
Shadow Gallery
Sieges Even
Sore Plexus
Spastic Ink
Spheric Universe Experience
Spiral Architect
Spiral Tower
Stormental
Subterranean Masquerade
Superior
Symbyosis
Symphony X
Syrinx
Tad Morose
Tal Dorgar
Taramis
Textures
Theory In Practice
Thought Industry
Threshold
Tiles
To-Mera
Tragedy Divine
Treasure Land
Twisted Into Form
Vanden Plas
Vauxdvihl
Vernissage
Voivod
Warmen
Watchtower
Wicked Maraya
Winds
Wolverine
Zero Hour

Some of these are harder and more abrasive than others:

King Crimson (really depends from album to album!)
Tool
Mastodon
Peter Gabriel’s first few solo albums.
Peter Gabriel-era Genesis
1970s-era Yes
Pink Floyd
Under the Sun
Enchant
The Mars Volta
Emerson, Lake and Palmer (avoid anything after “Brain Salad Surgery”!)
Spock’s Beard
Jethro Tull

Jimi Henrix Experience—“Electric Ladyland” (has some prog roots)
KISS—“(Music From) The Elder”—their lone stab at prog-rock, a horrible commercial failure, but one of their best albums despite sopunding completely unKISSlike
Black Sabbath—“Volume 4”, “Sabbath, Bloody Sabbath” and “Sabotage” were very proggy and very good. Rick Wakeman of Yes guesting on keyboards.
Led Zeppelin—“Houses of the Holy” and “Physical Graffiti” albums were classic, and also rather prog-influenced.
Queen—“Queen II” was by far the most prog-rockish of all Queen albums.

And there are many, many others . . .