Depends on what are you looking for. The one you've linked is VA panel. It's a middle-ground between TN and IPS, has great 'on paper' contrast ratios which are not always there. If you mainly game, and you are let's say competitive CS:GO or w/e else flicker shooter player, then look for TN's. If you rarely play at all, but meddling with photo/video editing then IPS is your friend with best color representation.
Don't go 240Hz - you most likely won't notice a difference. Jump from 60Hz to 120Hz/144Hz is huge, anything more is mostly marketing.
G-Sync = extra money. Unless you really want it, I'd go with freesync (as for some time already it's being supported by Nvidia too) it is open source, which means it's not significantly more expensive.
If you go for 27'' 1080p then I'd recommend ASUS VG279Q. If you can spend a bit more money, I'd look for something 1440p with 100Hz+.
If you can pull it off, I'd buy 2-3 monitors on-line and return the 2 you don't like within 14-days window you have according to EU laws. That's what I did
