Although I don't have any personal experience with the Kreitler Headwind unit, I've heard that it can be very loud. For that reason, I went with TruTrainer rollers and built a DYI freemotion platform.
http://www.youtube.com/watch?v=pLKzrTzP_os
http://www.youtube.com/watch?v=StcY7bG1xzs