JVC GY-HM150e (camcorder)
The files from the HM150 will not go natively into iMovie yet, though that software is due for an update. I've been told that the Quicktime files can be imported into iMovie if you download the Perian plugin ( http://perian.org/ ). I can't confirm that this will work with iMovie, but it did work on Final Cut Express when I tested it.
If you do decide to go to Final Cut (and at the current price I would recommend it), the files will drag and drop natively into your project.