Too Complicated?
Eh depends on how willing you are to tear appart you house to cool your computer. I bet the temps would probably be pretty good. As for affecting the whole house......personally the difference would be negligable.
<shrug> Not a bad idea.......just something I wouldnt try.
However I have toyed with the idea of taking an old outdoor air conditioner and stripping it of its compressor, modding the radiator for use on our watercooling systems, and using the fan to cool it outdoors. Even thought of putting a misting hose around the intake of the fan and letting that thing go.