I was born a rebel...so why not join the Outlaw posse'?

Question - I'm shopping for a subwoofer for our
entertainment room"...16' wide, 22' deep - the amp/preamp/speakers/HDTV monitor a set along the back 16" wall - carpet and padding over cement - walls are sheet rock over masonry bricks (does anybody in FLA use wood anymore?) - I am running a 400WPC McIntosh amp Mac preamp and Spendor S9 floorstanding speakers - the sub we're looking for will likely only be used in the Home theatre" situations, as the Spendor's already handle things quite well down to 35-40Hz. The only sub I have even HEARD recently was a klipsch (ewwww!) at Best Buy - of course, local audio dealers want to hook me into their $2000 Mirage or VonSchwiekert moidels...no thank you! So, what model Outlaw sub am looking for that will give me some nice, tight bass slam on the lower regions ans still be reasonably fast to recover so as not to sound "muddy" with constant bass overwhelming the entire sound track?

Thanks...I have LOTS of auido equipment knowledge, but not in THIS sub-region...