I'll second that Bricasti M7 ! It's not cheap but it totally redefines any impressions you might have about the term "reverb". It's not your typical verb you hear in a rock track on drums or a pop vocalist---much deeper.
A friend just bought one. He does some film scoring with the vst plugs and the occasional solo piano track with Ivory. He's used the Altiverb for awhile now but says the Bricasti takes his stuff to a whole other level. I'm trying to get him to lend it to me for a day to see what it sounds like on the D.
I have to get my Tascam recorder back first so I haven't been thinking about it too much lately. When I do I'll try and make a track with it if I can pry the Bricasti out of his hands.