Though the Vizio VO420E didn't quite make our Top 10 40- and 42-Inch HDTVs chart, this already inexpensive model just got a little more attractive with a sale price of $638 and free shipping at Walmart.com.
The VO420E is pretty easy to use and offers a nice set of customization options. This HDTV may serve you well if you aren't terribly picky about image and audio quality--but it probably isn't the best choice if you're looking to create a home theater system.