I'm going to buy my first sub but not certain which size would be best. My listening area is 3014cu.ft. with two openings on the same wall. One opening is 4' wide leading into another room that is 2010cu.ft.The other opening is also 4' wide in a corner leading to the upstair bedrooms. Also I plan on updating my avr in a couple of months from DPL to DD. Should I go with the cs+ or pci or wait for the pc+? My set up is mainly for HT with moderant to semi loud listing levels.(not as young as use to be)Thanks for any info.