Using the 12-2's with a Beolab 11 subwoofer and a BeoVision 10. The setup frankly sounded even better then I had hoped for. Really very, very impressive - in comparison, they sounded worse in the store (and they did not sound bad there).
Not sure what they were thinking with the 12-1 pricing - seems like it should be at least $5-700 less then the 12-2. The 12-3 has more authority by itself, but I much preferred the sound (for music) setup of a 12-2 + a sub - it also dramatically improves movie tracks (though for me its a mute point since I have a HT with slightly better kit).