I wouldn't keep the Marantz. I have the same 63se. At least in my experience, the Marantz proved to be an average transport. For $1500, you can get a great CD player or trans/dac at used prices. Or, check out tweakaudio.com. This Ric fellow is modifying dvda and sacd players.
Personally, I got the Alpha/Delta for about half your budget, and I am very happy.