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The critical issue with any sub is the setup not the manufacturer. However, there are a few things that apply universally: how large is your room, how loud do you listen and how much bass is in the music you listen to. A bigger room or higher SPL requires a larger driver and larger box. There's no way getting around that. There is generally no downside to choosing a larger driver and box, except for cost and space, so that would be my recommendation.
I've owned the SVS SB12-Plus (http://www.hometheatershack.com/forums/subwoofer-tests-archived/5769-svs-sb12-plus.html), which is similar to the SB2000.
I've never owned a Sunfire. The independent sub measurements at AV Talk, which seem to be no longer online, showed every Sunfire sub to be a poor performer. That's not surprising, they are small driver in a small box subs. But, if your room is small or you don't listen loud, then it'd probably do fine.
Again, it's setup. Kinda like retail: location, location, location.
The Rythmik subs are gaining in popularity amongst planar owners, They are very "fast", the patented Direct Servo Feedback design keeping the cone under tight control. The space between notes is not filled in with inter-transient noise, and the cone returns to "rest" without over-shoot. The DSF circuit even compensates for the change in electrical characteristics that is found in all woofers as their voice coil temperature increases under heavy load. Rythmiks are characterized as sounding "leaner" than other subs, with none of their often thick, heavy-footed bloat.