I've gone through the entire line of ROG Swift Monitors now, every one including the first 24" 144hz up to the 34" 100hz, and all the 27" TN and IPS models, as well as the 28" 4k Gsync Acer. Given the choice, I'd delete the Gsync as IMO it does little overall, and is by far the most expensive option in these new "gaming" monitors out there.
AOC does make a great bang/buck right now panel. Others too. If you can find an IPS (my pref as well, unless you're playing pro level FPS games, TN is inferior to IPS IMO) that has 100 to 165hz but deletes the Gsync, that's your best option if you ask me, based on all the various ones I've had, and I had some of the Acer Predator ROG competitors for a time too (same exact panel and tech, slightly different plastic case and controls is all over the Asus units).
I've been waiting for the new "UQ" 27" 4k 144hz IPS Gsync Asus to come out, delayed until q1 2018. With better VR coming out, I think it'll be the last expensive gaming LCD I buy, after that it'll be cheaper or TV options I think, as everything I play will be in VR for the most part anyway, negating spending 3 or 4k on several expensive Gsync high hz IPS gaming panels.
Of all the things I advise looking for in a good gaming panel, Gsync is the very bottom of the list. Just my experience and opinion on how much it matters, it DOES work, but really, in the grand scheme, doesn't mean all that much to me.
I do notice what Skuzzy mentions with high 144/165 hz displays and IPS tech, but for me, it isn't enough of a deal breaker, I much prefer the color and presentation of the IPS over the TN/NA/whatever panels, and also find that the high FPS that a 1060 to 1080ti/Titan can provide make it worth it to have a 100+hz panel. 75 is a bit of an improvement over 60, but I can instantly tell 75 from 100 or 144, and much prefer the higher.
That AOC above is what I'd buy starting over. Big time. 3 of them. I may even sell my ROG Swifts if I can get good $ for them, and buy a single 27" 4k Rog Swift 144hz, and 2 of those AOCs for the nephews/nieces machines at our place.