This is a very interesting idea :D. Cool idea using the change of phase to get rid of the heat and then recondensing it :D
Not sure if it has been asked, but could you use a similiar liquid to go below ambient? like if you condensed the fluid to below ambient (in an insulated case of course)...
Not sure if it has been mentioned, however you may want to check out LD's V-8/10 Pc cases. They have enough room all your water-cooling loops(2*480mm + 360 i believe) and them some! I think it is around 500$ so it may be out of your budget :(
This seems like a very intriguing idea, i have no hardware advice :( . But tell us how it goes! The idea of a touchscreen for key board is pretty cool :D