The CDT-8 Pro is a transport, that also has an upsampling converter on board (though it seems to be defeatable).
The CDP-9 adds full DAC plus preamp functions.
It you're looking for an inexpensive transport, the '8 is obviously a competitor to the few other ones out there (e.g. Cambridge), and there have been threads dedicated to this topic.
Googling the '9 for reviews and impressions, it seems to tend to hew to the, how shall I say, slightly less forgiving end of the spectrum that we're all familiar with.