well, to be honest, if you dont notice any ghosting when gaming, then there is not actually any point in investing in a new monitor.
my tft is 16ms, and my friends is 8ms, but when gaming i can not tell the difference at all, apart from that his is a bit brighter, but that is unrelated.
i wouldnt buy a new one unless you get ghosting. it is like a "blurring" when you are fairly high framerate, and one frame blurs into the next. it should be very obvious.