dual hsu uls15's or one klipsch rt12d

[cembros]

ok so im looking to upgrade my sub from a polk psw1000 which im very disapointed with to either dual hsu uls 15's or a klipsch rt12d. The guy at my local ht store highly recomended the klipsch, i mentoned the hsu and said to him that i wanted a dual sub setup but he said for the money the klipsch was the best choice. I suspect that he did not recomend hsu because they do not sell the subs, so i pose the question to the form. What is the better choice