I am slowly upgrading my home theater system and I am looking to replace my old Polk PSW10 sub. Newegg appears to have a deal on a Klipsch Sub-10 and I'm wondering if this is a decent upgrade path. I currently have Polk Monitor 70s in the front, a Polk CS2 center, and Polk Monitor 30s in the rear. All of this will be driven by a Yamaha RX-V671 once it ships (it's replacing an Onkyo TX-SR505). Any help or advice would be appreciated.