If I remember correctly my LG 32LD690 is 50Hz. I don't notice any problems with it, but I am not very critical. I can see the point in doubling up from the 25Hz interleaved field, and if the video frames were transmitted at 100Hz I'm sure that would be great, but in fact any accelerated refresh rate beyond 25Hz p or 50Hz i will have to be interpolated in the TV.
The difference will be very subjective, and more likely to affect fast action (eg sports), and then will depend on how well the TV does it.
That said, 100Hz TVs are pretty common now, and by the time you have ticked your other boxes you might find you end up with a 100Hz refresh whether you like it it not (I expect it can be switched off).