*edit*
how would i do it?
i have 2 pc's both pretty silent ..i know what its like to have a noisey one and i hated it ... your 333 is my only concern about the whole master plan .. you seem to have some cash to spend so why not get your self a cheap p4 mobo + p4 with just 2 hard drives in the box (or how ever many)you wont need any more fans .. i have 2 such systems i cant hear them nor do they run hot ...you could also use any size hard drive and taht would be a bonus as u willalways be getting more tunes + movies etc ..it could maybe one day be the center of all things media related in your house ..divx movies on the tv etc
id also maybe look at getting a very small case (shuttle sort of thing) and just chucking it in a cupboard somewhere
but you seem to need a few conectors for isdn etc or maybe u need to configure it ....oh get xp pro on it and use the remote desktop software that will be handy for you .