Oh, I just figured what you mean when you say "bi-amping with the Emotivas". The XPA-1 has two sets of binding posts. This is not true bi-amping. The two binding posts are connected to the same amplifier output stage, so you are basically just bi-wiring anyways.
Also, don't forget about your center channel. For home theater and movies, this is the absolute most important speaker. Skimping on this will definitely affect quality of movies and dialog and action.