Hi Balls Deep,
I, much like yourself, am also in the market for a fantastic gaming monitor to go with my shiny new high end hardware. I have done a lot of research on this topic, and without a doubt the PG279Q is the better option than the PG278QR. The quality is much better in terms of the display, and both are very fast panels, negligible difference in speed for gaming.
The real question here, is the major problem with the quality control of ASUS panels particulary the PG279Q where a very large amount of users have reported dead pixels and terrible backlight bleeding on the panel. This is the only reason I have not yet bought it, as a lot of people have through 2,3,4 5 even 10 return processes to find a panel that doesn't suffer from major problems.
I am also looking at the following alternatives:
acer predator xb271hu
However all the panels are made by the same manufacturer (AUoptronics) so they may all suffer from the same problems, just on a slightly different scale. I've read that ASUS is the worst though.
So I am stuck, were talking a lot of money here to waste on something that is low quality out of the box. I'm waiting to see if something better comes along in the next few weeks otherwise I might have to make a gamble and get the Asus, and see if it should be returned.