I bought the top of the line MBP 17" w/ 2.93GHz, 7,200RPM HD and 4gig Ram. When I try to play a 1080P video through QT its choppy and the sound doesn't match the video. Audio comes first followed by the Video Sequence. Also when I edit videos in iMovie or even Adobe Premiere the preview window plays the video preview back extremely choppy! I have my computer set to high performance and its still like that. I thought with the way my MBP is configured I shouldn't have had any playback issues. Anyone else having these problems?