i37100

Hi good people! I am little on a budget but I would like to buy some used CPU and GPU and upgrade my have a Lenovo Legion Tower PC (Y520T-25IKL) which now has: intel b250 16gb ram (2400mhz, I think) GeFroce GTX 1050 ti (4GB) Intel i3 7100 For CPU I was thinking an i7 6700k or i7 7700k for...