I can't do the comparison you want, but I can confirm the Panasonic HDC-SD9 works fantastically with iMovie 09. It appears in the iMovie window, and produces a Finder-style set of icons when you set up to import your files, allowing you to choose which shots to import. Import is quicker than real time, and the quality of the clips is great.
To use, the Panasonic is very impressive - good battery life, very light (compared to my JVC DV tape camera), has a flash for the digital still camera and quick to respond. Its only fault: not excellent in low light. It doesn't come with an SD HC card, so allow a little for that in your budget.