da_grudge:But with the digital input I cant have the direct stereo mode, right? It§ s supposed to produce the best sound, this mode...
In theory yes, that's correct, but you're balancing an improved DAC against a straight signal path, and with your setup I'd probably take the former swing over the latter roundabout.
The only way to be sure, though, is to compare the two. Any way you could beg or borrow a budget CD player - though not the Cambridge, it doesn't do mp3 - and compare? Alternatively, take your entire setup to a dealer (NAD or Marantz are the first mp3-friendly brands that spring to mind) and see if a budget CD player via stereo direct can beat your Oppo via digital into your AVR. I'd be quite surprised if it did.