The market here in Atlanta for used computer equipment is tough.
I just looked on eBay and various models of that card are available from $180 to just under $400. Sold ones seem to be sitting between $2-300. If someone was interested enough in that card, and considering the level of the remainder of the equipment I would think something like MAYBE $550+/- a little, maybe. I honestly don't know if I could Craigslist it as built and get that, here.
The motherboard is low level/office type. You have one stick of RAM which would hurt if you were looking at the sale from a gaming slant. The F skew CPU is worthless to a degree without the above mentioned valuable part. Your SSD is small, and the HDD is run of the mill and readily available cheaply. It's not IMO a system that someone would build outside purely budget driven decision when considering "gamers".
It would be a far better indicator for you to search your local market and see what similar items are selling for, if you can.
EDIT- Just as an aside, the above pricing is pure conjecture since you don't list case, power supply, or specific models of the equipment. Consider the generic answer as VERY flexible based on details.