I have a SCSI Plextor 12x CDRW (got it before the 16x or 24x came out) and an IDE Panasonic 50x CDROM. They do DAE at almost identical speeds, oddly enough. The Plextor is much less prone to errors in DAE if I'm multitasking. But for some reason when doing DAE with CDex, it sounds like a chainsaw, and the panasonic is pretty quiet. Very odd.

Plextor drives are about the best out there, though, highly recommended if you have serious DAE/CDR/CDRW requirements. It's worth it to get the SCSI card installed.

Good luck!