> Also, another side question, would it be able to handle 4k editing?
Premiere Pro can do 4K editing on nearly any modern Intel i7 machine. I've done it on 3-year-old iMacs (without 4K monitors, but with 4K video) and on my 2 year old. 3000x2000 Surface Book.
I have a 4K dual-monitor display at work and edit 4K with Premiere Pro all day on it.
BTW: Photoshop, After Effects, and Premiere Pro can all make good use of your video cards for rendering, transcoding, etc.