Good wireless A/V system for home?

[kefoo]

Hi! I'm looking for a wireless system for transmitting video and audio from my computer, through a wall, to a TV about 30 feet away. I've tried the 2.4GHz system available from Radio Shack. The video quality is good, but it introduces too much hiss in the audio, sometimes to the point that I have trouble understanding what people are saying. Is there a system available with very little signal degradation (digital, perhaps)? I'm willing to spend several hundred dollars for a nice setup.

Kevin