You need to look up the specs of tvs and look at the response time. Buy an HDTV that has a "game mode" built into its menu. Also, not every brand is equal. Consider a Sony or Samsung tv if at all possible. avoid lesser brands like panasonic, jvc, lg, and so on. It's not necessarily about buying the most expensive tv, but price is a factor as cheaper tvs don't have game modes.

Where you do buy a tv from, make sure you get the return policy details beforehand. Most places will let you return and exchange a new tv if you aren't satisfied with it when you buy it, so take advantage of that. Do some research, narrow down the tvs that seem to best fit your budget, buy the one you think is best and then test it.