Bluetooth range?

I am looking into getting a mac mini with bluetooth and the mac bt keyboard and mouse. I want to hook this up to my lcd tv in my living room and am wondering if anyone has any insight on the actual range of the bluetooth mouse and keyboard. I know that apple says that the range is 30 feet but I am wondering how true this is in the real world. I want to use the mac mini as a media center type computer and would like to be able to sit on the couch about 20 feet across the room and be able to use the keyboard. Thanks for any input.