Currently Being ModeratedJul 1, 2013 6:30 AM (in response to kellqlater)
None of the Elgato devices are suitable for what you want to do (capture & edit in iMovie, create a DVD). They create highly compressed H.264 files that you would then have to convert to QuickTime/DV or QuickTime/Apple Intermediate Codec in order to edit in iMovie.
Better to use your existing ADVC100 to capture directly into iMovie. The ADVC100 converts your analog video directly to DV, preserving as best as possible the original quality of your videos.