I use Wookiee's method for adding reverb to mixes. Add your preferred Reverb to the master track. Back it off a touch after you've got what you think is about right, then add a little more to each instrument in it's own effects bin to give that instrument a little more.
I must admit that sometimes I spend hours looking for just the right reverb for a track, it seems like one of the hardest decisions to make. I really like convolution, and just spent much time adding all the 'Perfect Space' Wav files over to ReMatrix Solo.
I feel like there is little too much on this track but then again it does give it an ethereal vibe which suits the material. Keep at it.