Jeff,
One last suggestion. 2 nights, 2 bottles of wine, 2 of HER favorite movies. (Nudge her towards picking out 2 movies with something suitable for testing surround sound. Outdoors stuff like beaches, woods, maybe a festival or something.)
Setup the speakers where she likes them, calibrate them, and watch a movie. The next night, put them where these guys tell you to, calibrate them (of course, making sure to get it absolutely perfect this time), and watch the other movie.
She no doubt will hear the difference, and FORCE you to put them in the right place. I ruined my woman. She went to see Troy with one of her girlfriends, and then made me promise to let her invite her over to watch it on DVD when it comes out. She said the theater sound "just didn't cut it.". Your wife might not know it yet, but yes, even women appreciate great sound. She'll bend on the visual properties.
