The Lite-On series are good. I have a 48x24x48 CD-R/RW/etc on my 4000. It won't burn DVDs, though.
The only complaint I have is that it's IDE, not SCSI. The IDE support in the 4000 ROM is not as up-to-date as SCSI support. You will need IDE-fix from Aminet (which has ATAPI support) to run it, unless you have OS4.0.
It can supposedly burn CD-RWs and CD-Rs using MakeCD or BurnIt or FryingPan. I haven't tried any of them. CD-R/RW support is built in to OS4.
tony