my uncle, who is not a computer guy, at my only semi-serious suggestion installed a server rack cart (he found on craigslist) in his den hosting his main desktop (a 4U server case i also suggested), a separate file server, other items relating to media, a router, and a server-scale ups.
the whole thing's actually pretty quiet. i was kind of impressed. even with hard-mounting the harddrives, they're still barely noticeable.