The fan that I suggested is a quieter then the ultra kazes and will push plenty enough air too keep even an OCed CPU cool. Seti aren't all intel boards faced left to right? I know amds are up and down (who's idea was that *face palm*)
The TRUE has densely packed fins which means that it requires a fan with a high static pressure rating. The easiest to acquire are the Scythe Ultra Kaze (which I have and it works very well with my TRUE), and the Silverstone FM122. The Ultra Kaze is a lot like the Sanyo Denki that Cabbs linked to, but much easier to acquire. I'd go with the 2000RPM model, although I have the 3000s.
Yate Loons are great cheap fans, but you want fans that are going to give you the most performance, right?