[via kiplinger] Prices on big-screen flat-panel TVs have taken a steady plunge in the U.S. since the first plasmas went for over $10,000 in the late nineties. But that's for no lack of quality or demand. The latest lines of big-screen LCD and plasma sets offer consumers a better bang for their buck than ever before. And as we have explained previously, if you want to keep some extra cash in your pocket this spring you can even take advantage of deals on last year's high-end models as retailers make room for the 2010 lineup. The below infographic takes a closer look at current and future trends of the flat-panel TV trade in the United States.