Ok, Last night, I biwired my new Polk RTi70 speakers and there was a definite improvement. I am using Radio Shack 14 ga. megacable for the lower frequency and Monster 16 ga. cable for the higher frequencies. I don't want to get into a discussion of whether the improvement is because the high/low frequencies are separated or because of the larger wire diameter, although I believe it to be the latter. Two months ago, I had a Pioneer Elite VSX-26TX receiver with a Polk RM6500 satellite speaker system. My system now is comprised of: Receiver - Pioneer Elite VXS-53TX Fronts - Polk RTi70 (biwired) Center - CSi30 L/R Surrounds - Polk RM2300 (satellites from RM6500 system) Rear Surround - Polk RM2600 (center from RM6500 system) Sub - Polk 100 watt, 8" sub (from RM6500 system) From those WITH experience, what should my next upgrade and the subsequent ones be? What is the most logical? What will give me the most bang for the buck?