A 17' ceiling? Really? My room is roughly the size of yours in l x w dimensions, and I have have pushed into the 100's on the SPL meter briefly, which means uncomfortably loud. 90's are no sweat though normally I'm running @ around 85-90. They are pretty efficient: I reach reference level (85) at about -17db on the dial. I use the M22's with an EP350 for the sub.

"There's too many notes!" M22ti VP150 EP350 QS8 AVR-2805 SCD595 Panasonic DVD-S35