Really it depends on what you consider a priority. High response time for twitchy gaming with eh quality color, or good color reproduction at the expense of response time. Also budget is a big factor.
If you care more about gaming, go for good TN panel 144hz monitor. Zowie gets a lot of love from the e-sports community. I have a friend with the XL2730 and loves the thing.
If you care more about color, then go for a good IPS panel. To get to the 144hz models you're going to be starting at a $550-$600 range and going up from there.