If he's not going to be gaming there's no need to get an alienware, and depending on how heavy editing he's going to do will determine if he needs an nvidia quadro which are usually quite expensive or not. For heavy editing look at MSI workstations. For normal editing go with any brand you like that meets your requeriments
It depends on the intensity of the editing images If it is very basic then a laptop with a gt 630m will do. If you want to do heavy intensive editing then go with a hp laptop with a quadrino gpu. They make good laptops for this purpose. You could go with asus if you prefer laptops that look good but they don't really cater for this need.