I'm all finished with 2 different video projects in Premiere 6.5 and ready to export them both from Premiere using the "Adobe MPEG Encoder" and bring them into a DVD authoring program called "DVD Lab Studio" by Mediachance. I will be burning a master of each to have DVD replications made down the road.
In that calculator you referenced, the item labeled "DVD Max Bitrate" is just a reference for how large your MAX video bitrate can be based on the dvd spec limit of 9800kbps (video+audio -- 10080kbps adding in subpics). Notice how it changes when you adjust the audio bitrate (it leaves a little room for menus and overhead). But I wouldn't necessarily use it for VBR MAX because you might be setting the video bitrate up to 9600kbps (and some encoders will periodically "spike" above your stated max number -- potentially making your dvd non compliant).
Also, if you plan to have a second audio track, make sure you change the number of audio tracks using the "Advanced" mode of that calculator.