Right now I have a modest ht system. It includes a polk 6700 surround sound system mated to a sony 2es with a sony sawx700 subwoofer. The sub houses 2 10" woofers mated to a 250 watt amp. Now the sub actually does a fairly good job for what it is. But as my name suggests I love bass and am in need of more. I plan on upgrading to an axiom system in the next few months but I want another sub first. My ht room (which is my living room unfortunately), measures app. 14 ft x 20 ft and has a large uncloseable opening which opens into a dining room which is 10ft x 14ft which has a small doorway which opens into the kitchen. The ceilings are 8'. Now I listen to about 10% music 90% ht. I was originally looking at the 25-31 pc plus but am thinking I would like a little lower tune. So I am trying to decide between the cs ultra single package or the pb2 plus. Which would you recommend and why. Also should I keep the sony sub or would it not even be noticed? Thanks.