This is nice... what did you used for the choir?
This actually consist of two native Reason 4 patches, one panned to the left and one to the right. The one panned to the right is called "FEMALEAHHH.smp" and the other, panned to the left is "female choir.thor". I also added some reverb to both of them, plus some minor tweaks. I can send the Reason save to you if you want.
Please contact me if you would like to use this in a project. We can discuss the details.