Another sub I've read up on some is the Mirage S8, $200 from amazon and seems to be reasonably well liked. As a brand I'd be more trusting of Outlaw or Hsu though.
No rush, if anyone's got some input I'd love to hear it. I'm tackling a turntable first.
Axiom M3Ti
NAD C320BEE, C542, PP-2, Rega P2 w/ Denon DL110
Grado SR325
HT in the living room