TN has lower response time, but you won't notice the difference between 1 ms and 5 ms, most people won't notice it. But if you really want to move up a bit and decides to go with TN, you should consider going up to 144Hz, but £200 is the cheapest they have, not exactly a reduction in price I know, lol, just a thought/suggestion
If it was me with that budget, I'd stick with IPS for better picture quality and color accuracy, it is nice to have your games look good
http://uk.pcpartpicker.com/part/aoc-monitor-g2460pqu