Let the hive mind of Engadget get that for you.
"I am looking for a device that will stream sound from one source to several recipients. For example, I want to stream sound from my TV or stereo to my phone or MP3 player that has radio and Bluetooth capabilities. I have looked into radio transmitters and they seem like a decent choice, but I can't find one that uses external power (USB or from the plug) and I would want one with a transmit range of around 50 meters. Thanks!"
If you have a good HD TV with 1080i native resolution and a good progressive scan player, I don't believe you will notice much, if any, difference. I have a 34" Panny CRT and a Harmon-Kardon DVD player. The picture from DVD's is so sharp and clean most people ask how you can tell the difference between DVD and HD. Maybe on a larger screen it would be more noticeable. My rule is buy decent equipment at a decent price and ignore the hype!