Very nice setup!
It's a very smart move replacing the copper pipes with plastic parts. It must be a lot lighter and easy to make.
You're inspiring me to improve my plain 5 gallon bucket; water always stabilizes between 30º - 35º, mostly related to load than ambient temp.
I'm thinking on a variation of your setup, where there's only a support structure for the wet pads, and water rises by capilarity instead of being feed from the top.
Please give us more details about the operation, like:
How much water "drinks" weekly this system, or how much and often are the refills needed?. Is it working 24/7 or how many hours daily? What kind of load has the pc, Seti? folding? or just normal work with plenty of cpu idle time? How much rises the temp after several hours of heavy load?