[bambam]

If you can get the video into quicktime you can step through and/or play at slower speeds. If there are any teachers on here who use a mac, they may know of a golf swing analysis program like cswing or v1 pro that will run on OSX.

I think on the camera, the main thing to worry about is your shutter speed so you can capture the high speed motion as clearly as possible. The higher you can set it the better, but the higher it is the better lighting you will need. My old camera went up to 8000 and it was pretty clear, but I think as low as 4K will work pretty well.