Definitely get a 1440p monitor with 144hz and a low response time. I have the PG278Q and love it. Of course it is more in the northern end of $600 but There are others out there with different specs for a lower price. Gsync boosts the cost of the monitor, so look for one that has those specs without gSync. A friend of mine has the Vsync version of my monitor MG278Q and hes even running a Nvidia GPU, just not able to utilize the vSync feature and its still amazing. You can pick one up for around $500 now, but there are other options out there.