madmacs: An excellent DVD on clan:clan conflict and clan:crown conflict is "Clans of Scotland" narrated by Paul Murton. It gives an interesting and engaging summary of 12 of the most historically powerful and influential clans. It can be purchased at Amazon, and I imagine many other places, for about $30.

A truly superb video history, "A History of Scotland" starring (narrated by) Neil Oliver and covering Scotland's story from its first recorded history is similarly available for a bit less than $50. While it covers clan conflict, it does not emphasize it like the "Clans of Scotland" does.