Let the hive mind of Engadget get that for you.
"What is the best wireless surround sound speaker solution? I have a home theater where running wires is just not feasible. I have my own speakers, so I don't want a system that has speakers with integrated wireless. I've done a far amount of research and have only come across a few companies that even offer a reasonable solution: KEF, Kenwood and Rocketfish. Is there anything else out there? What do you recommend? Thank you!"
TV Genious: You can call and cancel the vouchers and re-order new ones to extend the vouchers. Just make sure that they DO NOT EXPIRE, as you cannot get new ones after the original expiration date. I did this to wait for the Echostar---