I don't dislike Rythmik. The subs perform well, and that has been proven multiple times. I do have some problems with some of the claims Rythmik makes about their technology, but at least the fundamental performance is there. I don't know what your problem is with the advice that I dispensed in this thread. Two Hsu's vs one Rythmik is a no-brainer, especially since the OP is going to be using speaker level inputs. I can't believe you would object to that. If it were one F15HP vs one ULS-15 mk2 where money is not a concern, I would probably say go for the Rythmik since the higher-tier 15" drivers from Rythmik seem to have a bit more displacement capability (so long as the LFE input is being used). I am not really impressed by the servo-feedback technology but it doesn't matter since the base performance is good and the subs aren't extravagantly expensive.
Btw, the FV15HP does not play louder over the entire frequency range than the PB13-Ultra. Take a closer look at the measurements, both short bursts and long term. The SVS does exceed the Rythmik output around its port tuning.