What is the best HD-DVD authoring program?
 

Since Sony isn't going to support HD-DVD (Im a Vegas & DVDA user), I might as well get set up with a good HD-DVD authoring solution.

I have been using Ulead Movie Studio+ with fair results to burn HD-DVD on standard DVDs. One of my problems is it dosen't work with 720P HDV files (among many, many other problems).

It seems the Sonic Professional Software is the industry leader right now. On 9-6-2007 they announced a "HD-Quickstart" authoring package for HD-DVD. All they have on the website is DVD-it Pro HD for $499.00 as of today. No telling what the "HD-Quickstart" package will cost, but I don't really care at this point.

Does anyone have any knowledge of the Sonic product or have another recommendation?

Thanks!