My best bet...wish I knew. Whenever the upgrade bug bites me, I feel like a nomad wandering the desert, hoping to stumble upon great sounding gear. And now starting to wonder if the HE560 would be more worthwhile than a new amp...Sure do love the HE500's though. A new amp vs the HE560...My wallet despises the upgrade fever
I bought my Dac/amp for the very reason of preventing myself from buying the 560 when I'm already quite pleased with the 500s, now when the reviews start rolling in I can decide if it's worth going to a 560 or a 6 in the future.