My mother in law has a sony camcorder. Whenever she gives us copies of her videos they are in .mts format. This is extremely frustrating because they don't play on my mac. I know I can convert them, and I do...it just takes forever. I'd like to purchase a camera of my own. What format should I really be looking for? It seems AVCHD is the best, but it's not really supported on Mac? Is this true? I'm so confused. Any help is greatly appreciated. I'd be looking for a camera that records in full HD and is compatible with iMovie. An external mic input would be nice, too. thanks.