Well, if you don't want 4k but do want g-sync, then the AOC G2460PG is the go-to option once you rule out the Swift.
I am still really pleased with mine. As I reported in my thread, the viewing angles aren't brilliant, but PCM2, who knows far more about these things than I do, suggested this is an issue common to most 120Hz+ TN panels.
The colours are perhaps a little over-saturated for my tastes, but this can actually look a bit better and more vivid in games (the only time I notice it as a detriment is with skin tone in photos).
The contrast seems really good. Been playing around with some test images, and it is definitely better than my last screen overall, if tending a little bit towards brighter shades and over-saturation at times. Excellent bright whites, though, and lots of detail in dark scenes. Very much liking the impact of g-sync too.