I am going to order my Sub soon not sure which i should go with the PCi or PC+? My room is small like 12x15 with a large open wall on one end. I have Polk RT2000's with a CS350 and Polk rears running of a Denon 3200 right now. I like bass, i will use it mainly for movie watching and music listening (club, hip hop, rap). So i am looking for whichever will do the all around job the best. Not sure if that is the 20-39 or the 25-31. Thanks for the help.