Hello, I've currently got an Yamaha RX-V620 amplifier setup with the Jamo 102 HCS 5 speaker package. While I do sometimes find the sound good, it's not as refined as I'd like. So I'm thinking of upgrading to a better amp. I'm currently split between these two choices: A new Onkyo 606 or an used Marantz 7500. I can get the Marantz for about 80 £ less. I'm actually not that interested in the HDMI features of the Onkyo amp, but rather the sound quality and how well the amplifiers works paired with the Jamos. Thank you beforehand for any input!