I would honestly disagree with the above statement. You said you play fast paced gamnes so you really arent going to notice how good the picture looks. why waste graphics power when you can use that power for more FPS. If it were me i would get the best bang for the buck. for fast paced gaming your monitor should check the following boxes.
1ms response time
minimum 144hz (240hz preffered but pricey)
Gsync or freesync is a must ( depends on what bran gpu you have )
anything else is just gravy on them taters.
check those boxes and i promise you that you wont be disappointed. i personally like the look of the ASUS monitors. Never been a fan of Dell/alienware.
Also just looked up that ASUS monitor before submitting my reply, dude go for that one for sure. that thing is a beast. you definitely wont be disappointed.