We are looking to upgrade our camcorder and get out of the dark ages of SD format on Digital 8. But I've discovered that almost all the camcorders prefer to use AVCHD format and iMovie doesn't apparently play well with it. It requires an extra step of converting the file to a format like mp4 that iMovie likes. Some of the cameras do have the ability to shoot in mp4 from the start alleviating this problem but am I correct in reading that the AVCHD is "full HD" while mp4 is something of lesser quality? My real question is, if there is a quality dropoff, how much of one is it? It's just home movies but I want the quality to be as high as it can be within reason. Can someone give me a rundown on the pros and cons of the two formats?