I think the refresh rate is not of much importance in case of LCD bacause the screen is backlit. Even refresh rates much lower than 85 or 75 should not cause any problem and even 60 should do fine.
The response time is very important, but the problem here is that different manufacturers quote it differently and it seems there is no standardization. For eg. Black to Black, Gray to Gray etc. Ie., in order make the figure as low as possible, they find different ways of calibration. For this reason, a model with 8 ms respose time may perform better than another brand with 4 ms.