best home theater sub for b&w 802

I just recently upgraded to b&w 802, htm1, and 805s for rear. before that i had definitve technology. so i am kind of new in the sub market. I am roughly 80% theater and 20% music. i was wondering if anyone has had this system and what they used and why. also has anyone heard the mcintosh ps112? any thoughts? thanks for all the help.