Which subwoofer to mate with my system...........

I have a full Paradigm Signature S1, C1, ADP1 system in piano black. I have a M&K MX-350 MKII in real cherry wood. The sub plays well but I need something that will plummage deeper and blend better with my SIGS......I am looking into a JL Audio F113 in piano black......Any Suggestions...

I would get the Paradigm signature sub(s).
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Actually I use and SVS PC Ultra with a Velodyne SMS-1 and it integrates almost perfectly with my Maggie 3.6R's.