AnandTech: Spring 2004 DVD Performance Roundup: More DVD Dual 8X . A good roundup. They liked the NuTech DDW-082 the best. Just $85.
The major caveat though is that you should wait until this summer to buy a DVD Burner if you can. The new 16x drives are coming and they support dual layer, so you get 9GB on a single DVD rather than just 4.7GB.
Another case of wait if you can.