looking to get a new monitor for gaming

I need a new monitor for gaming

I have been looking at the Asus VE248q and the 258Q although these are not IPS monitors the response time is 2ms and on all the IPS monitors that I have seen the response time is 6ms or higher why is that
 
im looking for a 24-25in full HD resolution the Asus 25in is 250.00 but if there is something better i could spend a bit more like 450.00 max
 
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