I'm also looking for a good DVD-ROM drive.
I read a review of the Asus here ASUS DVD-E616A cdrinfo review.
But that exact model is hard to get, the ASUS DVD-E616A3 is a lot easier to get.
But it only has a 198KB data buffer.
And a bad user experience with it here : ASUS DVD-E616A3 (John Davis from Reading).
OK it's only one bad experience (the other experiences are for the A and A2 models and generally favorable).
Asus probably had one or more reasons (RIAA, DVDCCA ?) for it, but a data buffer of only 198KB ?
Sounds almost just as funny as Bill Gates saying : "640KB ought to be enough for anybody."