I don't know why you would need 144mhz, but I think gsync would be great for your needs(but they are REALLY EXPENSIVE!
Gsync: http://pcpartpicker.com/part/acer-monitor-umfb0aaa01, http://pcpartpicker.com/part/aoc-monitor-g2460pg,
http://pcpartpicker.com/part/acer-monitor-umhb0aaa01
IPS 60HZ: http://pcpartpicker.com/part/lg-monitor-22mc57hqp, http://pcpartpicker.com/part/acer-monitor-umvh6aa003,
http://pcpartpicker.com/part/lg-monitor-27mp33hq
144HZ(NO IPS): http://pcpartpicker.com/part/acer-monitor-umfg6aab01, http://pcpartpicker.com/part/asus-monitor-vg248qe,
http://pcpartpicker.com/part/aoc-monitor-g2460pqu
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I coud not find any ips gsync monitors within your price range. I also could not find any ips 144hz monitors within your price range. All of the monitors above have a 5ms response time or less.