No need to match brands between your sub and your speakers. There are a lot of brands out there for subs, and my friends and I are happy with our subs that are all different brands - SVS, Aperion, Infinity, and Polk. I have no experience with Hsu, but I've read quite a few recommendations for them.
Personally, I sucked it up last year and bought an SVS PC-Ultra. I am extremely happy with it. My experience with SVS customer service has been first rate, and I'll recommend them without hesitation.