I have a Denon 3802 receiver and sapphire st 2 speakers ,Mirage 790 and polk rt8. I also have a yamaha 700 watt receiver.I have a pair of B&W 602 speakers that I am looking at for 300 including a center channel in the same line. I don't know that much about B&W and want to know if this a good deal. The speakers are in mint condition.