Just bought a Harmon Kardon AVR 125 receiver and HTK 5 speakers setup for $600 new @ Circuit City. Was it a good buy? Is it worth buying one of those calibration kits (Video Essentials or Avia) to calibrate this system or my Sony 27FV16 tv? If so, where could I buy it online (called several local shops, and couldn't find it anywhere). This is my first HT system, so I want to make sure I do the right things.