I'm looking to buy a new 4k iMac, I currently have a mid 2012 macbook air 2ghz core i7 with 8gb 1600 mhz ddr3 ram and an intel hd graphics 4000 1536 MB. And i use this for editing videos i screen capture off of my original playstation 4. Now i want to buy a 4k imac to continue to edit videos, but I also want to get into graphic design and solely to just have a desktop. What specs should I get, from what I understand a GPU card 2gb or 4gb isn't something I really need. Please help with suggestions and some experiences.