I have an Onkyo 502 75 watts high current 6.1 receiver. Its pushing my Athena as-f1,as-c1,as-r1. I just feel that my receiver is underpowered. Don't get me wrong they sound great together, but I feel the Athena's have potential to sound even better. I am think about replaceing my Onkyo with either a HK or Yamaha. My budget is $400. Any suggestions on a receiver with more juice for my Athena's.