Awesome episode, with some lame scenes, but the artwork is much improved (go back and watch early Bleach, it's the same quality) and the music really suits the scenes, except for when Inoue attacks Yami with Tsubaki and they play that death-scene piano music (though Tsubaki appears to die, so maybe it is appropriate).

My choice of 3 are:

Ichigo
Hirako
Hiyori

They are all Vaizards, which out-class even captain-level Shinigami. I think Ichigo is the main target, since the last time we saw Aizen in SS, he stated "what an interesting human you are" or something like that. Maybe he's considering a vaizard-arrancar hybrid?