new silent computer

I just got myself one of these

http://www.mini-itx.com/store/configure.asp?sid=hush-b3&config=4G132EN0SN9

It's fucking awesome, you can't hear a thing even under heavy cpu and disk load

I wouldn't even know where to begin in building my own silent system. Also, it would probably be shit. I just wanted something that works with minimum of hassle.