Subwoofer for Nola Boxer

No more than $400-500!

Thank you for all of your replies. The Boxer is a wonderful speaker that belies its price tag. It has a really engaging soundstage, tight bass and loads of detail. The little Bryston is a really good match. It just lacks that last tad of bass. I generally do not use subs because most of my past speakers, PSB, Dynaudio, and Aerial were 4ohm and I found no need for a sub. 

All of these sound good and I may narrow it down to the RSL or SVS!

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?

Thanks! I have never even used a sub! Most of past speakers and amps had plenty of power!