Subwoofer for Nola Boxer


I recently put a small second system up that consists of a Bryston 2B-LP Pro, Acurus RL11 and Nola Boxers. I would like to add just a tad of bottom end. Any suggestions for a compatible Sub? Something with a small foot print and medium power. Thanks.
rocket94
Thanks for your input. The more that I hear about the SVS SB-1000, the more that I like it. I am using an Acurus RL-11 pre, so I am assuming that I will be using one of the pre outs for a sub.
Does anyone here know how to run a sub out from the Acurus RL11? Would I use one of the pre outs to the rca's on the sub?
There are two inputs on the sub and two outputs on the preamp so use them both on each.
Thanks! I have never even used a sub! Most of past speakers and amps had plenty of power!