The Liteons need a fix just like everyone. Get it here:
As I recall from the reviews, the 1693 is a two sheep burner (there are no three sheep DVD burners) so it should be just as good as the 1673.
Make sure you get KS0A firmware.
If you go with BenQ here is a source for region free firmware:
If you are in the US, Newegg.com is a great source for either drive. OEM is fine.