I currently have the JBL SCenterII, the S36II for the rears and an SV 39-20 subwoofer. My last piece of the puzzle is the fronts. The debate is between the S310II's and the S312II's. The only difference seems to be the 310II has a 10" bass driver while the S312II has a 12". The price difference is about $100 for the pair. With the SV sub do I really need the speaker with the bigger bass driver or will the S310 suffice?