Here is a link to a review done by COF (Crazy Old Fart) at S&V forum that he did on the new $400 PBS10-ISF subwoofer by SVS. It has become a "Hot Topic" in the forum world (AVS, HThifi, etc). On posts will be links to different forums about this review & links to other subwoofer reviews. Alot of discussions (some seem heated toward each other-imagine that!). It took a $400 subwoofer to "stir-up the pot" about subwoofers (not a $2000 subwoofer)
Outlaw Audio also has a hot new sub that's selling around $500 that was actually designed by Tsu Research. I guess it competes pretty well with the $1K up subs.