what to add

I currently have a GTX 1060 6gb GPU and an I5-4670 (not the k version so no OC) My motherboard is a Gigabyte GA-H97M-D3H so the most powerful CPU I can get is the i7 4790k before having to get a new motherboard then a new CPU. Should I buy the i7 4790k for 420 Canadian and just switch...