Well, ported vs sealed is never an easy topic. IMO, for "toons"(cartoons/movies), or "tunes"(musical ones), it comes down to quality of the driver, enclosure size(appropriateness for the driver), and integration with the mains. I prefer ported for their efficiency. They'll have greater output until you get below port tuning. sealed subs have a more gradual roll off slope, but they require much more power, and excursion to match a ported subs output. They typically start to roll off a little higher too. If your mostly into music, an sb2k MIGHT be enough, but my hunch is not. I had an sb2k in my system (with 2 ported cylinders), and while it was an amazing sub for it's size, it just couldn't provide enough output to be meaningful.(I have too much airspace). The short version is both designs can be musical. As long as the design, and materials are solid. I still think(by guessing your budget, and WAF) a PC12plus will give you musicality, power, and a smaller footprint(16" diameter). I've also been window shopping at Rhythmik. I hope you can follow my post, lol. I wrote it over the period of about an hour, and while multitasking. aye carumba...I will call SVS. Sounds Like they have great CS. The SB13U is a little tough on the wife factor. The SB 2000 is more wife friendly I mostly listen mostly to music 40 percent movies. Whats your take on ported or sealed for toons. My room is going to be tough.
The price difference is significant.
Since SVS has very friendly shipping, I would try the SB2000 first.
If you find the SB2000 lacking (doubtful but possible) really listen to the system and try to determine if the deficiency is lack of volume or if there is something else that is not right.