photon, your suggestion is great for a bargain basement kind of option, but seeing as the OP said she doesn't trust Klipsch, and is looking for something "good quality" (:P), I expect her to look elsewhere. It isn't out of the question as a sub for a room of that size, though.
I'm glad to hear fleury took mine and CP's advice to go with SVS; even happier to hear him pleased with his purchase. The PB12-NSD (see official Canadian distribution wesbite for SVS
here) is certainly an option for the OP as well, but I didn't think given her budget and room size that it was
necessary. I'm sure she'd enjoy it, though!!
Let us know how things go in your search.