On the note of cooling fans, I will just add that cooling fans can be VERY useful for controlling the temperature of the KoP pneumatic compressors, which can otherwise get VERY hot during extended operation (and consequently, less efficient).
Thermal Grease would also be useful to have if coupled with something like a
CIM cooler.
12vdc power supplies could be great for robot test benches (so that you wouldn't need a battery), but would likely require some sort of specialized adapter to functional for FRC uses.
On an unrelated note, I'm disappointed you guys don't seem to carry HAF Mid-Cases anymore, I used one for my PC build a few years back and absolutely love it. I tried to find one for a different build more recently and couldn't find them anywhere. =/