If i shoot on my EX3 @ 1280 x 720 60p - what project settings in Vegas 8 do i use?
The only setting that comes close is hdv 720 30p in new project settings.
There is a double ntsc rate selection that i can use in this setting - is this what i need to use?

In vegas you can make your own template for project preferences.
Drag the clip onto the timeline, right click on the clip on the video track (not audio), this will give you the project properties, you can then make a project preferences template to match, when done, name and save that template.

Paul