I want a computer to use primarily as an iTunes machine connected to my hifi (via AirTunes). I'm very fussy about background noise so I would want it to be basically inaudible. Tiny hard disk sounds like an iPod makes are just about acceptable but any hum or fan noise is totally out of the question. Are either the MacBook or MacBook Pro going to be quiet enough for me? Which is quietest? The Air is out of the question due to its lack of disk space. I've read that the iMac is quiet but it's too big, not portable, and I don't want a desktop computer in my living room. The new computer would replace a headless Mac mini that I control from a Windows laptop via VNC. This works remarkably well but involves a bit too much geeky complexity for my taste.