Quote: "Kamelot"
Saw them live in London on Sunday, fan-bloody-tastic. Their support bands were Serenity and Dream Evil, who weren't as good, but enjoyable none-the-less.
Not all of the bands under your list come under symphonic or progressive, In Flames for example is Gothenburg Death Metal.
To add to the list:
Dimmu Borgir (They're a symphonic sort of black metal, so yes, growling)
Haggard (Okay, they folk/classical, but worth checking out)
Iced Earth (More power than symphonic, though it has some symphonic elements. I preferred their temporary singer they had in 2007 for the Framing Armageddon album and tour - I've seen Iced Earth twice, and by comparison I think the temporary singer was better)
Stratovarius (One of the bands that inspired Nightwish, the band rather than the vocals)
The Tarjas (Ex-Nightwish singer's new band)
Therion (Now split-up, but a fantastic band)