Download the executable one put it on a USB stick when you go to the shops, then ask em to demonstrate it for you.
You will be able to compare what you have at home with whats in the shops,
remember to fiddle with screen settings as not all manufacturers calibrate the monitors to perfection.
This is for the colors, the response time will be a subjective evaluation that you make for yourself.
http://www.flatpanel...l&id=1229341512
Here is an explanation with the technology behind and the pros & cons of the different panel types.
http://www.flatpanel...l&id=1229335030