Seeking a vocalist for instrumental, ambiental, prog metal project

I'm looking for someone who can clean sing and growl, not much screaming. Here is a song (actually 2 songs edited into one for the time being) that I'm working on that you can improvise on. Ability to follow the beat and tone is necessary.

http://soundcloud.com/dreamspell/n-w-demo-edit

The first part, before the piano is called Nascency, and after that is called Wanderlust. The growling should be wherever there is distorted guitar, and clean singing on where there isn't.

EDIT: By the way, the low quality (128kbps) is on purpose and one of the layers are muted (leady guitar parts which go over the ambient/instrumental parts).