Well, the address is
certainly in a commercial zone. I wouldn't think a scam site would list
real contact info in their domain registration. Wonder if it'd be worth calling one of the surrounding businesses just to ask whether an audio shop recently moved in nearby? Or if nothing else, if you use a Visa or Mastercard or similar you've got built-in fraud protection.
Well, if the NXG sub doesn't work out, you've still got options. You know, I want
not to like the Fluance sub. Typically, speaker companies who sell subs as a means of completing a 5.1 package (Klipsch, Polk, etc.) put very little effort into their subwoofers, and you end up spending too much money on something mediocre. For what it is, though, the Fluance sub looks pretty decent. An F3 of 30Hz and a weight of nearly 40lbs. is uncommon among 10" subs, hinting that effort was put into the build. I'd be interested to see nudie pics and response graphs of it, but haven't had much luck in my searches.
Regardless, I'd still give the edge to the Dayton SUB-1200. Given similar excursion limits, a 12" sub will simply move more air than a 10" sub. Additionally, the Dayton's F3 is lower (25Hz), so you'll hear more of the lowest tones and rumbles.
But, if wife acceptance factor is a consideration, the Fluance sub is definitely prettier.
You might also consider picking up a used sub.
A few of these look like a great bargain -- the CSS SDX10 sub, and a couple of Paradigm PS1000 offers, for example. In which province do you live?