I just bought the SVS PB10 NSD (430$), it hasnt arrived yet, but i have heard nothing but good things about it. SVS seems to only make good stuff, and i plan on buying more from them in the future. I would say save up and get the SVS, its only 130$ more, and chances are it is going to out preform anything else in that price range. I have also heard good things about HSU, i took a look at their line up, but i decided to go with the SVS because i like their "style" more, also the specs on the SVS seem better than the HSU.
I will get back to you when i actually get the PB10, and give you my opinion.