If you want to take some of the "edge" off, try the Counterpoint SA-20 or SA-220. (The 220 is the later version with a couple of minor updates.) 220 WPC of hybrid bliss. There is one for sale now at $700. Go for it.
Your next upgrade might be a pre-amp. A good tube model like the Audible Illusions M3A (around $1100 used) might be a good choice. Even the older Audible Illusions pre's would smoke the Adcom and they can be had for well under $500.
I would think that the SA-20/AI/Vanderstein combo would be great, depending on your taste in music. The Planet is about all you'd need in a CD player, but you could upgrade to an outboard DAC later if you get the bug. What are your plans for analog? (FYI- the AI pre has a fairly good MM phono section. Some even came with a great MC phono section.)
Regards
Jim