I've looked around my local stores and never found an SVS brand

Buying online the warranty gets pretty tricky though...
Hard to believe out of all the reviews I've read, everyone says the SVS PB10 outperforms the Sub 12! Again, rookie at home theater stuff so yeah...
My current sats on the ProMedia are okay, but it kinda lacks the lower mid range to very high bass, so I thought about getting either a sub with very high frequency response range or some sats with good lower down response. Not sure how I'd hook the ProMedia sats to anything else.
Would an SVS PB10 or PB12 sound good with Klipsch speakers?
Thanks guys!