Man, those Sierras look great! Judging from your wife's reaction I thought they were posing some sort of hazard requiring hard hats or something. I think they're a great size. Have you had a chance to do much listening? I know you said you were apprehensive about the volume of your surrounds, but how do the Sierras sound with your music?
The in-ceiling surrounds look nice, too. I see why wall-mounting rear surrounds would've been difficult now. Your house has more alcoves than any other I've ever seen.
You know what
that room could use, though....