Looking for a monitor under £150

Hey,
I've been looking for a new monitor to replace my current 21" LG TV (1680x1050 resolution) and am not sure what to get? I would like it to be between 22 and 24 inches, as well as all the stuff like 1080p, good response time and colours etc.
I do play games such as Battlefield 3 and Planetside 2 on High settings so would like a monitor which would work well on games with decent response times. IPS or TN I'm not too sure, if someone could help me decide it would be great.
So basically I am looking for a monitor under £150, good quality, good for gaming and I don't want any secondhand monitors please.
Thanks in advance for any answers!