I have a rMBP that I'm thinking of selling, since I use it less and less every since I got a Surface Pro. I'm looking at getting something for video editing and general schoolwork. Usually I don't look at Mac desktops as I can usually build one for cheaper, but the 5K iMac is the same price as a 5K monitor, and I have a machine to concentrate on my work rather than be tempted to game lol. What would be the best for my needs?