My friend just upgraded his system to a new I7-7700K which meant a new motherboard and memory as well. He offered me most of his old parts for $300. Its basically identical to my primary system and the parts will be used for my wife, son, daughter as a secondary system.
So for $300 I get:
I7-4770K cpu
MSI Z87 G45 mobo
32gb of 1600 DDR3
500w power supplier (cooler master, corsair or EVGA cant remember)
I think the $300 is fair for the cpu and memory alone, and the mobo and power supply is kind of a throw in. Am I crazy it seems pretty fair, let me know.
PS: I know he tried overclocking it once or twice but never ran a overclock for long periods or did any kind of mining with the system.