Those'll work fine.  I think my masscool"s are about 20.

So, an update on my fan setup (without pics, maybe tomorrow).  I was able to get 3 x 60mm fans tied together and then zip tied to the side of the PSU, and have them powered directly by the breakout board terminal screws (I don't care about fan speed, I want them running at full speed, screw the noise).  I have them so the airflow is facing outward, meaning the outside air is sucked through the PSU, instead of trying to push the air through it.  Seems to work very well so far, the PSU is noticeably cooler than previously with either 2 x 80mm or 2 x 60mm fans.