Most of the most commonly used programs used in both photography and video editing ie, photoshop cs3, adobe premier, etc, can be used on either OS. Its hard for me to believe Macs have any advantage to an equally/ appropriately geared PC loaded with the same applications. Back to the question at hand. The time to buy a prebuilt system is never. Unless you are in search of a laptop, the best value for your money will always be in building a system yourself. With a...