50% off for a used component? Would love to know where I can get my PC parts for that much.
Anyways, how much should it be priced at all together? Since you guys are dwelling on the CPU/mobo, an i5-6600 would be comparable performance to the my 2600k @ 4.5Ghz (at least based on this
video). Going on PCPartpicker, I see the cheapest 6600 is about
$219 and the cheapest 1151 mobo is about
$54. So that's $272 for modern parts vs $220 for my older parts. $52 difference for around the same performance. Factoring new vs. used, I'd take off another $68 ($25% of $272) from my build's subtotal. Asking $900 and selling for $825 still seems fair to me.