burning to a La Cie external burner

I have an iMac G5 (10.4.2), combo drive. I also have a Lacie d2 External 16x Dual-Layer DVD+/-RW Drive with FireWire/USB2.0 (Model 300920) as my external burner.

I've created a 20min. movie in iMovie and imported it into iDVD, and am hoping for some guidance on how to get this puppy burnt onto a playable (read: video) DVD disc.

As I understand it, I have two options:

1.) in iMovie, export the finished movie to QuickTime, and then use the bundled Toast Lite program (which came with the La Cie) to burn to DVD, sans menus. Has anyone tried this, and can verify that this is a workable option?

2.) in iDVD, create a disk image of the project. Here's where I get hazy; La Cie couldn't tell me how to get the disk image onto DVD using its burner; I know that Toast Lite does not support the disk image format; Apple Support refused to consult with me on the issue; Can anyone shed some light as video onto a DVD as video using the La Cie?

One other question: tomorrow I'll be near a Mac with a super drive. If I burned the disk image (or iMovie project) to DVD as data (versus video), and loaded it up on the super-drive equipped mac, would this work? Or would it be looking for local files that weren't there?

Thanks very much, in advance.