Mr. V,
Having done a bit more research, and reading some posts at AVSForum, it looks like one (or maybe I should say, two) of your SVS subs is the best route to take. No need for me to try to reinvent the wheel and maybe end up with something mediocre.
Being familiar with my Klipsch speakers, and taking into account the room arrangement I described, which SVS setup would you recommend? I have a B&K ST140 amp I could use, if it's a decent candidate, but I think it's not renowned for it's low end punch. I'm open to either the PC series or buying another amp. My Denon only has an 80hz crossover option, so not much adjustment there. Is that a problem for an external amp sub?
Guide me, oh bass master...
Ross