The full version of Cinema Craft Encoder is a very high quality mpeg encoder. But like CDan, I prefer Procoder. Maybe I'm just used to the interface.

Cinema Craft also have some professional mpeg encoders that run about $38,000. Can't say that I know much about them other than they exist.

Sonic Scenarist is one of the top authoring programs for dvds, blue ray and high def dvds. but it isn't an "all in one" solution. But if you are truly serious about dvd production, it is one you should consider.