Personally, I went with the PW-2200 in my Klipsch system. I have the RF-3's, RC-3, RS-3's with a PW-2200 sub. I wired my old Sony SA-40 subwoofer in speaker level with my surrounds. Man, this system rocks!!!!!!!!!!!! The back sub made a difference in both 5 channel music and home theatre.
Haven't looked at the specs of the reference subs but they are probably out of my price range