Can't go through life being paranoid about whether or not your system will be a bugged one. All you can do is ask yourself if you want one, can you afford, and will you love it. If all of the answers are yes then go for it. If it happens to be bugged, that's how the dice rolled for you.
But in my own personal experience, I got a Wii that is bug free. And I'm lovin' it.