What is the best noisy fan to sleep with?

I really like having a noisy fan in my bedroom to sleep with. The problem is that the fan I have now sounds like it is about to bite the dust. Plus, this fan isn’t as noisy as I thought it would be. Even with the fan on the highest setting, I can still hear noise from outside my bedroom. Here is the kind of fan I have now:

http://www.amazon.com/Lasko-3733-20-Inch-Box-Fan/dp/B00002ND67

Is there any fan that is noisier than this one?