What GPU are you currently working with? Personally, if I were you, I'd take the following course of action:
Hold on to your 4670k and determine if you're getting an adequate amount of frames w/e you upgrade to the 11 series. The i7's do have the edge when it comes to high refresh rate gaming, but you might not even need it depending on the settings you're working with. If you aren't getting an adequate amount of frames, the 8700k is the absolute king of high refresh rates, just mind that you'll need both a board and RAM update to go along with that new processor.