Buy the lowest cost LCD that suits your needs for the next two years or so. The reason is because LCDs and Plasmas will be obsoleted by the new OLED (organic light emitting diode) technology.
Consumer Reports magazine or On-Line is an excellent way to select from what is currently available. Vizio is often the best value.
IIRC, Dynex is carried by Best Buy and is often priced 20 to 50 below a comparable screen-size and model of VISIO. Wal Mart carries Visio and even in their lowest pricing on sales, the Best Buy Dynex model is cheaper.