Your call if you choose a 1080p Gsync / freesync or a 1440p IPS. A 1440p moitor will serve you better in everything but gaming, where G-SYnc / Freesync makes a significant difference.
I will give you some good monitors form each category though.
North Americans can buy 27" 2560x1440 Korean monitors from IPS LED Monitors who offer a 14 day Return Policy.
http://www.ipsledmonitors.com/default.asp
From these, choose the Yamakashi Catleap. The Yamakashi Catleap uses an 8 Bit LG S-IPS panel and only works with PC's. It can be overclocked up to 120hz.
Otherwise, see the Crossover 2795QHD. The Crossover 2795 does not use LED PWM Dimming, can be overclocked and has excellent colour presets, high contrast and fast pixel response times. Mind the custom taxes though.
http://www.ebay.com/itm/New-Perfect-Pixel-Crossover-2795QHD-AHIPS-LED-27-Monitor-2560-x-1440-DVI-D-/131431218296?pt=LH_DefaultDomain_0&hash=item1e99e93c78
If you can take advantage of Freesync, look no further than Asus MG279Q. The Asus MG279Q uses a 27" 2560x1440 resolution 8 Bit AUO AHVA panel, a nearly grain free matte coating, excellent colour presets when the Racing mode is selected, a high quality matte grey bezel which vastly increases the perceived black depth, fast pixel response times and a 144hz refresh rate.
https://pcpartpicker.com/part/asus-monitor-mg279q
If not and you do not want a Korean monitor, look at the LG 27MB85R-B. It has excellent colour presets, a matte grey bezel, low input lag and fast pixel response times.
https://pcpartpicker.com/part/lg-monitor-27mb85rb
Finally, if you are more interested for a G-Sync monitor, your only good option is AOC G2460PG. The AOC G2460PG has better colour presets than the XL2420G and is cheaper.
https://pcpartpicker.com/part/aoc-monitor-g2460pg
Bear in mind that you can combine best of both worlds (G-Sync and IPS 1440p) with Acer XB270HU, if you cannot take advantage of Freesync. You need to raise your budget for it though.
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