hi i am using 4970k with msi z97 mobo and 16gb ram from very long time my pc works fine no issue at all but i want to upgrade my whole system i am thinking about going for 8th gen 8700k aur 9700k which cost me alot. need some advise what should i upgrade my pc and should i sale my old hardware what ll be good price for system parts to sale i am not in touch with hardware resale from some time please some help me out