Most all tv's are 60Hz (or 50Hz). 120Hz tv's are 60x2 = 120. Each frame is played twice, in simple terms. Anything above that is just multiples of 60 (or 50). TV mfs call their motion interpolation alogrithms by different names. LG, for example, calls theirs TruMotion. Besides the doubling etc of the refresh rate, most also offer controls to fine tune motion interpolation which are judder and blur. How good the implementation is will vary from mfr to mfr. Because everyone can perceive motion interpolation differently (some love it, some it makes sick, others are in the middle) you need to find a couple of tv's in your price range, look at the other features, and then see if you can "interview" them at a local store.