The Polk PSW 505 isn't a bad sub per se. But if you want a real performer then ID subs are going to give you much more value for your money. As far as the rest of Polk subs go, they're not very good.
Television: Mitsubishi WD65737 DLP
Processor: Emotiva UMC-200
Amps: Carver AV 806x/Behringer EP4000
Mains: DCM TimeFrame 600 Center: AT 453C
Surrounds: AT 251.1 Sub: Danley DTS-10
Blu Ray: Panasonic DMP-BD655