here are my few choices, Infinity Intermezzo 1.2s 850watts(RMS), Definitive SuperCube I at 1500 watts, a Sunfire Super Junior Subwoofer rated at 1500 watts, or an Earthquake Super Nova MKIV 580 watts, I will be getting rid of this cheesy KSW-10 sub that I am running at the moment, I will be coupling one of those subs with my Klipsh Synergy Quintet micro system, the sound that comes out of these little babies is unreal, anyways, which sub would any of you recomend, I want to make a long term investment, no more cheesy subs for me, thanks again.