It also depends on the area you live if you want to try selling it on Craig's List. If you live in a bigger city you will get more hits from buyers but then are up against more competition. If you live in a small town, you may not hear from anyone at all, BUT you might get to get more for it with a buyer wanting it with no alternative competition.
I am no longer selling anything on eBay because of their working with the IRS and state revenue governments*. That and their fees and the cost of shipping something sold across state lines. These days, I just sell my used hardware on CL in my city. I posted a GTX 970 for $200 and got a hit within three hours for it. It was sold the next day. I would ask $250 and see what happens. Miners are still snapping up powerful previous generation GPUs for much more than they were worth this time last year.
*I have a BIG problem with the IRS and state department of revenue offices thinking that they are validated that we should pay income taxes on items sold that we purchased with our POST-TAXED disposable income. But that's for another thread.