OK, maybe I'll get better help if I clarify my goals a little bit. I'm trying to figure out just how big (and how nice) of a sub to get. The goal really isn't to be able to wake up the neighbors. One episode of the dishes rattling in the cupboard and the whole system might end up out on the curb while I'm at work

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I'm currently looking at some Klipsch RF-62's or RF-52's for the L & R. As for the sub, I'm not unable or unwilling to pay for something nice. I just don't need to wake the dead. What I really want is nice clarity, minimal distortion, and faithful sound reproduction at reasonable household volumes. I'm not trying to replicate a rock concert and I don't necessarily need to feel the bass. I would like it to sound "right" though and I'd like a full spectrum of sound.
I've looked at the SVS PB10-NSD and the PB12-NSD. The HSU VTF-2 MK 3 would also be an option. They're priced within my (recently expanded) budget. Together with the rest of the system, would there be enough bass to acheive what I've described above?