Since you're not going to high resolutions or VR (which a 980ti supports well, mind you), you might as well keep it. shyt is worth like half what you purchased it for anyway. It'd just be wasted money. Plus, we haven't seen any real benchmarks yet for the 1080. People are saying it's 20% faster than the 980ti/Titan X, but who really knows? Now, if you can return it back to the store you bought it from for full price, then do it and buy the 1080. That way you won't be wasting any money and will actually save $50, all while getting better performance (however minimal it may be). If you're going the eBay/Craigslist route, I say it's not worth it.