Unless you like upgrading your gpu frequently, I wouldn't go 4k. The gtx 1080 can barely play triple A titles on ultra at 60fps. The higher your resolution the more frequent the upgrade will have to be as newer games come out. If you want to purchase a graphics card and keep it for 3-5 years, i'd highly recommend staying with 1080p until amd and NVidia catch up wit the 4k hardware.