In my Living room I have a Klipsch KSW-200, which pretty much loafs most of the time. Never really pushed it that hard, but its got headroom to spare.
Looking up some old Subs, I am now considering the following: KSW-100, KSW-10, and KSW-150. The KSW-100 and KSW-50 might work too, they have an 8" driver. I am leaning toward a used KSW-10 right now.