Depends on what you plan to do w/ the monitor.
WAY more work-space on the screen, when not doing any gaming. 4K on a desktop here puts 1080p to shame here. This is just a whole another realm entirely.
About 4K & pricing - for what 1440p monitors have been w/ even off-name brands + lower-name brands (i.e. QNIX, BenQ, Acer, etc) at around $200-220 on sale, one could just go 4K w/ that Samsung 28'' TN panel and say "Screw it; I can downscale. I've got any resolution b/t 1080p and 4K here. I'll just crank AA up if need be + also sharpness settings on your monitor, if needed."
I can drive w/ my 970 some games at 4K, some can't. WWE 2K16 PC is fine here w/ 50-60FPS in-game w/ matches & 25-30FPS on the entrance sequences; and IMHO here you don't even need to turn AA here (not like there's much out in distance here normally anyways; this ain't an open-world game). 1080p was never a challenge for me on this 970 for most games - I can get easily 1080p60FPS at mostly High to Ultra settings. Dying Light runs like crap at 4K here at even Medium (20-35FPS), but runs just fine at 1440p (50-60FPS) on High.
I usually keep VSync Off b/c I want more frames + I can just use MSI Afterburner to impose caps anyways at my own will. Only really need VSync On if there's screen tearing, graphics weirdness, hit-detection goes out the window, physics go out the window, animation go wrong, and/or anything else goes wrong graphically.