I just recently bought the Onkyo SR600. Overall I like the sound but it lackes the detail my old H/K had. I saw the SR6200 and SR7200 at my local HIFI shop. I can exchange my Onkyo for either one of these, the increase would only be $100 and $200 respetively. The questions are, am I going to notice a big difference in sound quality, And second is their a big difference between the SR6200 and SR7200. Thanks.