Here is my list of subs I am looking at for my new setup. The new setup will be an Onkyo 703, Polk RTi8's for the fronts, FXi3's for the rears and the Polk CSi5 for the center. Here is my short list of subs. 1) HSU STF-3 2) Velodyne DPS-12 3) Velodyne DLS5000R 4) SVS PB12-ISD 5) SVS 20-30 PCI My room is around 15'wide x 17'deep from the back wall to the seating area with 10' ceilings. It is an open floor plan that goes on into the kitchen area. Any help is appreciated.