Klipsch Synergy SUB-12 or JBL ES250PBK

[SlaughterX]

I am in the market for a new sub and so far I think I've narrowed it down between these too. The JBL is $40 cheaper... but I'm not sure if it's more powerful thant he Klipsch sub or not (Amazon says the JBL is 400 watts, but it doesn't say if that's the RMS or the peak), where as the Klipsch is 300 watts RMS, 650 peak (or dynamic, as they say). The Klipsch is also downfiring, though I wouldn't say if that is better of worse (the sub I'm replacing is a much less powerful downfiring Boston Acoustic sub). If there is anything else better in this price range (no more than $400) I'm open to more options...