just something i realised that might be of use.
but why dont you head down to your local auto parts store and pick up a 12vdc blower for a cars AC system? the fans in a car arent really noisy even on the highest setting and im pretty shure they will have a pretty decent cfm/pressure curve as they have to force a decent amount of air throughout the evaporator coil, heatercore and the ducting.
the only thing that i can think of that would be a problem would be wiring it up as the speed of the fan isn't controlled by varying voltage in some cases instead you would have to rig up some kinda controller.
sorry if that has allready been thought of before.
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My rig: 
P4(northwood)2.6C@3.0, 1 Gig of Kingmax DDR433@460Mhz, a grandmars(rebranded powercolor i think) 9800xt, Cooled by Four case fans:
three 80x80x25mm delta 50CFM fans@5000 RPM, the transparent blue led side panel fan that came with the case, a pair of blue vantec CCFLs and a Coolermaster Aero4. all controlled by my vantec nexus.
To be watercooled:
DD RBX
Maze4 chipset
silverprop Cyclone fusion HL
swiftech MCP-600 pump
custom aquatube based rez
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