I would recommend the Benq 1620, or the older NEC 3500.
I'd steer clear of the 3520 as I've read that it isn't as solid as the 3500.
Cdfreaks.com provides a great deal of information regarding DVD burners including very in depth review. I'd check it out. Also, remember that the quality of your DVD media is as important as the quality of your drive.
CDfreaks.com