It is perhaps not so simple an answer.
First of all, what is your budget?
What graphics card do you have?
It probably takes a card stronger than a GTX970 to generate more than 60fps in most games.
What games do you play?
It is fast action shooters that depend most on fast graphics.
Games such as mmo, sims, strategy games depend in fast single core cpu speeds for performance.
What is your need for image quality?
ips panels give a better image, while tn panels give faster response times.