Your "crappy" CD transport will do fine, as long as you add a good reclocker and a good S/PDIF cable. Then the disk does not matter, the transport does not matter.
Driving a new DAC with the stock transport will be disappointing IMO, no matter what you get, except maybe Benchmark DAC3. Too much jitter from the transport. Here is typical jitter from a transport, even a decent one:
http://www.audiocircle.com/index.php?topic=154408.0
The other advantage of the Synchro-Mesh reclocker is it upsamples to 24/96, so a better sounding digital filter will be used in the new DAC. IT also provides galvanic isolation, so the transport to DAC ground-loop is eliminated, lowering the noise floor.
Steve N.
Empirical Audio