I've gotta really recommend Lite-On's DVD drives. I've had one of their 16/40's for about 6 months now and I'm in love with it. Very fast DVD and CD read speeds, and pretty quiet to boot. As for Toshiba, I had one of their 16/40's for about 3 months and got fed up with it due to the fact that it was slower than molasses. It took a good 8-10 seconds just to recognize a disc, and its speed at ripping DVDs for DivX conversion never went above 1.2x (whereas the Lite-On pulls a solid 3-4x). I've also owned a Pioneer slot-loader, I loved it right up until the loading mechanism broke and it would no longer be able to engage a disc. Now that I've owned a Lite-On, I doubt I'll ever go back to Pioneer or Toshiba.
--Just my $0.02