check out sinergy, has alexi from children of bodom, and their first album had jesper from in flames, but there is in no screaming. its a girl vocalist, who was or still is married to alexi. warmen is also in that vein and is led by cob's keyboardist.
and if your not a fan of al di meola, that can guy can tear it up
orchestral metal? listen to nightwish
opeth isn't all screming
- the last two - their not too worried about speed, but great music
sadly you limit yourself with no screaming - wanna hear some real technicality, listen to dillinger escape plan...most can't handle it