I've got the 27 inch 2k Predator monitor and it is glorious. GSync is amazing. Eventually I would want a 4k monitor but 2k 120 fps is better than 30fps @ 4K.
You goddamn right. Got the ROG 2k 165Hz G-Sync and I'd take that before any resolution bump. I'd be turning settings down anyway to get that sweet higher framerate.