Gaming of course. Video/Photo stuff on the side.
Probably only one graphics card, my old gaming rig (it was a massive tower which is why I'm trying to build a smaller PC) had an NVIDIA one so will probably go down that route.
Intel for processors, 12GB of RAM should be enough really. I do have my old 12GB of RAM which I was just going to re-use unless anything has changed significantly.
Budget is about £800, maybe more.