"I think I will sell my Oppo and get a Mac Mini. Bel Canto is coming out with a new line of asynchronous USB converters which I will consider."
Given your budget considerations, do you happen to have an extra laptop or other pc that you can dedicate to computer audio, at least for starters? I ask this because for some, a Mac mini is only incrementally better than a well-integrated pc system. And your Oppo is perfect for not only those SACDs, but also those times when you want great audio and video from DVD or Blu-ray.
Also, consider existing versions of Bel Canto USB converters, typically selling at half retail, that are Centronics-based and excellent for resolutions through 24/96.