I've got to go with BITS. Look at the songs that have opened the last album tours
ANTR - see YTSECullen's comment above
Constant Motion
Root of All Evil
As I Am
I just don't get the same feel from OTBOA. For an opening song, I'd think any band would want to keep the energy up from the excitement of the show starting. The intro tape begins to roll, and they want to 'ignite sonic rage' (sorry, thought that was funny). Anyway, I don't see the 90 second accoustic and percussion buildup on OTBOA doing that. I see an intro tape, leading into the Shaman, following with the choir and harp, and (cue Emeril) BAM! the riff at 1:36. Just like the thunder/lightening from ANTR.
That ... that ... that's how I see it.