Well not quite, he did say he has two options of choosing between 2x Alpenfohn 120 wingboost fans or 2x Silverstone AP-121 fans, so the question is not anywhere near as open as you imply.
edit *** for the records both fans were made to be silent running fans that direct air flow into a funnel shape rather than just a wide spread of airflow, something that is ideal for pushing air through the fins on a rad, so it might be fair to assume he is after a quiet but effective set of fans. Check out this
video for on the Penetrators.