I'm with MK, for around the same price ($2,294 for black ash, shipped to "continental 47" states, don't know what happened to the 48th), dual Rythmik FV15HP's are going have the most output.
Another option, depending on your time horizon, would be to wait for Outlaw to have another sale on the LFM-1 EX for $549 shipped, and get 4 of them.
Of the options listed, especially if you are looking at the deepest frequencies, the PB (PC) 13-Ultra would get my nod. If you are not as concerned with <30HZ though, then the pair of Hsu's would outperform a single Ultra (going off of Audioholics list).
If you are most concerned with aesthetics, then the SB13 is the only small sub mentioned, but that room is much too large for the SB to pressurize.
Augustine's Law: "The last 10% of performance generates one-third of the cost and two-thirds of the problems."
"If it works the first time, it's not high end." ~ Harry Pierson