The 4010
It's a nice machine at first blush, and knowing Denon, it's probably worth the price, but I'd still have reservations. After owning a 5910 for a little over 2 years, I'm about 90% satisfied, and that 10% dissatisfied is the rub. It's the Denon Link 4th Edition that is causing me the heartburn--don't trust it. Found that using the Denon Link 3rd Edition on the 5910, which seemed to sound great at first (using CD/SACD/HDCD/DVD), caused everything to sound a bit fuzzy and dull, without the detail and spacious open sound that a good CD (like a Telarc SACD) is supposed to have. Removed the DLIII and, connected a digi-coax and all at once, that dull sound became open, spacious, airy and detailed. Dropped Denon Tech an email and asked what about this? Know what they told me...? They said, connect the 5910 using analog coax. What kind of answer is that? They said it was a better than a digital connection, becuz the 5910 has great DACs. If that's the case, why bother with a "Denon Link" at all? For that matter, why bother telling everyone it's so good?
This sort of answer from Denon makes me seriously reconsider the owning of any Denon product, not to mention their new 4010 or for that matter the new A1UDCI which I was seriously considering until this Denon Link problem became apparent.
Just my two cents worth and I'll vote with my wallet.