It didn't take much arguing. After my first point, mentioned above, the only other thing I had to say was that if she was going to object to my spending on audio gear, then I was going to have to take a thorough look at what she was spending on clothes/shoes/purses. The debate ended promptly right there.
Gear: Speakers (Paradigm Reference Studio Series): 40 v4 (front L/R), CC-690 v4 (centre), 20 v4 (surround L/R). PSA XS30 (subwoofer).
Denon AVR-X4000, Emotiva XPA-5, Samsung PN64F8500 (64" plasma), DarbeeVision Darblet DVP5000, PS3, Sony BDP-S6200, Apple TV (3rd gen.), Harmony One, Sennheiser RS180