i echo the wavebird option.. the wavebird is absolutely awesome... my girlfriend actually bought one as well so she didnt have to use the corded version.. I even use the wavebird when I used to sit about 4 feet away from the console...
it was just nice when you can pause the game, set the controller down on the opposite side of you and not worry about the cords..
as far as battery life.. I think I have replaced the batteries once and it has been over a year now... so when compared to use the batteries are worth it.
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