Conclusion: The Onkyo TX-SR506 is a fine AV Receiver and the sound and connectivity options it offers for the money are fantastic. If you can live without HD sound for the moment, it makes a great value purchase.
Pros: As the central hub to your home cinema system the Onkyo 506 makes a fine choice. It allows all your devices to be easily connected together and easily switched, as well as giving you the full immersive surround sound experience that we all love.
Cons: If you want to take full advantage of HD sound as well as HD pictures, this amp is not for you. The Onkyo TX-SR576 which will accept an HD audio signal, or the TX-SR606 that will decode it as well, are the ones you should be considering.