I am using an old school (circa 2004) Thermaltake Armor full tower case. Last year I cut it up and started modding the hell out of it.
This is how it started...cpu water cooled, single 240 radiator in the front, pump on the bottom etc etc.
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This is how it sits now...cpu/gpu water cooled, 360 radiator up front, 240 radiator out the bottom, five Delta fans, holes cut in mobo tray for better wire management, top cut off and new dome welded for more exhaust fans, new door and window, a lot of ultra flat black paint, etc etc, etc....its a tank and has been dubbed the "Heavy Armor" as it weighs over 50 lbs fully assembled.
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Here is a link to my case mod over at overclock.net...
http://www.overclock.net/t/690720/heavy-armor-tt-armor-dual-gtx-radiators-bunch-o-metal-almost-done