With all the recent deals on the Nvidia 1080 video cards, I have jumped on the bandwagon and am now looking to upgrade my 27" 120Hz 1080p monitor to something that takes advantage of the power of this card.
From what I can see of the current choice of monitors on the market, they generally require compromising on feature or price. Am interested to know what you think is the best out there at the moment for gaming that is 27"+, IPS, G Sync, 2k/4k and ~$1k in price. Also interested to hear about performance from anyone gaming at 4k with a 1080.
The Acer Predator XB271HU looks like a good option but concerned about reports of poor QA on build quality.
For the specs you listed (27"+, IPS, G Sync, 2k/4k and ~$1k in price) there really only is the Acer XB271HU or the Asus PG279Q. They both use the exact same IPS panel (AU Optronics) and as you already know, both have a number of QA problems and are still a bit of a lottery. If you really must buy one, then make sure you get it at a store where you can return easily (i.e. local shop).
There aren't any other IPS G-SYNC monitors out currently as only one IPS G-SYNC panel is currently available (AU Optronics). LG and the other main panel manufacturers haven't released their panels yet as high refresh IPS is still a new tech. It's probably a good idea to wait to the next generation of IPS G-SYNC panels to come out before you bite the bullet.
4K gaming on 1080 card is feasible but won't be super high FPS and you may need to reduce quality settings for certain games.