some (possible) new additions..
nevermore - no growls, insane guitarist(s)... s/t and in memory are slower albums, following 5 are great, with slight hesitation towards enemies of reality due to production...
opeth - watershed.... i can't get enough of this album, I was an opeth fan before, but this album is one that I can repeatedly listen to without getting bored...
carcass - heartwork... growling... but IMO their best work, every single song is a masterpiece I think...
evergrey... anything... no growls, technical band...
BLS - earlier stuff is definitely better... more raw...
into eternity - prog/thrash/...? great band, variety of singing...
mastodon - good all around...
Hope this helps...