Here are brand new prices.PCPartPicker part list
/ Price breakdown by merchantCPU: AMD FX-8350 4.0GHz 8-Core Processor
($139.99 @ Newegg) Motherboard: MSI 970 GAMING ATX AM3+ Motherboard
($95.99 @ SuperBiiz) Memory: Corsair Vengeance Pro 8GB (2 x 4GB) DDR3-2133 Memory
($54.99 @ Corsair) Video Card: MSI GeForce GTX 970 4GB Video Card
($399.89 @ OutletPC) Total:
$690.86Prices include shipping, taxes, and discounts when availableGenerated by PCPartPicker 2017-02-19 06:36 EST-0500
But since your components aren't brand new, price reduction is 30% to 50%, depending on a buyer.
So, you can ask from $350 to $490 for your components.