I would look into the SVS SB2000 and Hsu VTF-1 mk3 as well. Maybe also the RSL Speedwoofer. The nice thing about subs is that if the baseline performance is good, all you have to do is keep adding more of them, and its the same thing as getting one massive sub. Once a certain qualitative level is achieved, all that is left is quantitative, and that can be had by simply adding more of the same sub. Also, a bunch of smaller subs can achieve the same SPL as a larger sub more efficiently. These are the reasons why I don't really have a desire for massive subs, cool though they might be. You can get the same SPL and low distortion from a bunch of smaller subs, and get better room response and use less wattage per dB. And its also much easier to physically manage a bunch of small subs, and there are a lot more places that they can fit. The only caveat is it might cost just a bit more per dB. The pros far outweigh the cost though, at least for me.