i was offered a HK 520 reciever today at a great price to replace my AVR125. My reciever was manufactured 1 month before the 520 was manufactured yet the 520 has quite a few upgrades compared to mine such as EZremote, 7.1, higher power and HDCD. Is it worth selling my 125 and keeping the 520 or should I just walk away? The price I was asked for the 520 is amazing. Can anyone help? thanks!