Subwoofer recommendation

Hi AudioGon community,

I'm looking for a used sub that would integrate well into my system and where I can purchase.
The sub is for music playback and I want it to blend seamlessly with the Revel speakers and not be difficult to place or set sub settings. My max budget is $400-500.

I have Revel M106 speakers and a Plinnius 1800 Integrated Amp.  The integrated amp has preout  and loudspeaker connections (no sub out).

Room is approx 12' x 12'.  Please also recommend cables. I've read a lot about subwireless systems, sub eq systems but its a bit overwhelming.

So far my considerations are:
SVS SB12
Revel Concerta B120
Rel T1

  Thanx for your help AG folks, Fred