Watching Jayz2Cents and company doing Extreme Overclocking with LN2 and stuff, and dealing with moisture and I'm over here wonder why they're not putting the computer in an acrylic bucket and letting the LN2 displace the air around the computer. Put a top on it, leave a hole a bit bigger than the pot with the pot located inside, and let the LN2 boiloff displace all the wet air with Nitrogen.
You'd effectively eliminate condensation issues.
(In theory other gasses could work too, but LN2 is self replacing in this system, and effectively free, it's just going out into the room otherwise.)
Ted Hart-Davis