Does the AW2521HF monitor still have a longer response time than an AW2518HF? I have to buy a monitor as fast as possible and I don't know whether to opt for the old TN or the new IPS. I have seen that it has 1ms in the fastest mode which will surely suffer slightly from ghosting. Does the same goes for AW2518HF? I hope someone from the staff can answer me to recommend the best.