After Forever und Within Temptation ist noch eine dritte Stilrichtung: Gothic Metal.
Melodic Metal geht eigentlich auch unter Symphonic Metal.

Mal ne Liste aller Bands die irgendwie in eine dieser Kategorien passen. (Quelle: www.metalstorm.ee)

Symphonic:
Adagio
After Forever
Avantasia
Bal-Sagoth
Cradle Of Filth
Demons and Wizards
Edenbridge
Gaia Epicus
Haggard
Kamelot
Luca Turilli
Nightwish
Rhapsody
Symphony X
The Gathering
The Sins Of Thy Beloved
Therion
Tristania
Vanishing Point
Virgin Steele
Within Temptation

Power:
Ancient Rites
Andromeda
Angel Dust
Angra
Avantasia
Blind Guardian
Children Of Bodom
Concerto Moon
Demons and Wizards
Dio
Edguy
Evergrey
Freedom Call
Gaia Epicus
Gamma Ray
Hammerfall
Helloween
Ivory Tower
Kamelot
Lost Horizon
Luca Turilli
Magnitude 9
Nightwish
Norther
Onward
Over Us Eden
Primal Fear
Rhapsody
Royal Hunt
Shaman
Sinergy
Sonata Arctica
Stratovarius
Symphony X
Tad Morose
Thoten
Vanden Plas
Vanishing Point
Vintersorg
Virgin Steele
Yngwie Malmsteen

Gothic:
After Forever
Charon
Crematory
Dreams Of Sanity
Entwine
HIM
Katatonia
Lacrimas Profundere
Lacrimosa
Lacuna Coil
Leiden
Lullacry
Moonspell
Paradise Lost
Saviour Machine
Sentenced
The 69 Eyes
The Gathering
The Sins Of Thy Beloved
Theatre Of Tragedy
Therion
To/Die/For
Tristania
Type O Negative
Within Temptation