Perhaps you're ready to move up to a flat screen television. As a savvy shopper, you've decided to buy used, hoping to obtain a good-quality set and keep more of your hard-earned money in your own pocket. Since TV technology is changing at a rapid clip, it's not hard to find quality used flat screen televisions for sale by home theater fans who've already upgraded their systems.

Flat screen TVs are actually available with picture tubes, just like regular sets. These sets receive little press, yet are designed to offer quality viewing at every angle. Flat screen televisions are ideal for both large and small rooms, since seating doesn't have to revolve around the placement of the TV. Even chairs and sofas that are at an angle to the entertainment center will have a good vantage point with a used flat screen television.

If possible, look for a used flat screen TV that offers a high-definition multimedia interface (HDMI). In lieu of that, you might consider purchasing a set with a DVI input that is high-bandwidth digital content protection (HDCP) compliant. Doing so will help to make certain that your set will be compatible with HDTV tuners, as well as any HD DVD players that may become available later.

Beware of older flat screen models. While an older set may suit your purposes, you may find that many don't support more recent HD content. Many of these sets work well with gaming, standard television programming, and even DVD players, yet simply cannot provide the higher image quality you may crave.