We're having a hard time trying to figure out which Optura mini DV camcorder we should buy. We have a powerbook G4 and have read and being told the Optura 40 is the best pick for compatibility. We like some of the features of the Optura 400 & 500 however and the price of the Optura 300. Despite phoning Mac and Canon we have not been able to get a definitive answer as to how well these products work with imovie4, which is what we're running. We would appreciate any feedback. Sincerely, Angela Hunt