Yep. In the US, it's a no brainer with the prices we get. At those prices, if you could get 30 or 40% off MSRP off a good sub from a traditional speaker manufacturer, likely they could be a comparable value, too. But undoubtedly, the SVS Audio subs are a good choice.
There is also the PB-1000
which would fit your budget. Brent Butterworth at Sound and Vision (who does their individual sub reviews) felt it was the best value in a $500 sub: http://www.soundandvisionmag.com/blog/2013/04/19/review-svs-pb-1000-subwoofer
It is my understanding that the PB-1000 is only a slight notch down in overall max output than the larger PB12. So better for room filling bass than the small 12" sealed SB12. But I also understand that the SB12 and PB12 are a step up in driver quality, so they should have a little better sound. Doesn't seem like the PB-1000 is bad at SQ; just the others are a little better. For home theater usage in your size room, I would definitely go with the PB-1000 over the SB12 for the extra overall output and the better low bass extension down to 19hz. There are a lot of effects in movies that really benefit from good output below 30hz.
Also, for your price on the PB-1000, you could get two of them over a PB12 (something Butterworth points out in his review), negating the advantage of the extra max output on the PB12. Two subs can have the advantage of doing a better job of countering room modes to give a smoother frequency response through a wider listening area. So you could start with one. If you don't feel the sound is up to par, SVS normally has a good return/exchange policy (check that distributor). If you like what you hear, you could always upgrade with a second one later on Edited by cel4145 - 8/9/13 at 7:24am