It's also possible we are both speaking relatively. The HushPC is quiet -- because it has no fan and has no vents (that noise can escape from), and has the quiestest harddrive now sold (seagate barracuda). So I'm certain it's quiet. But, (this is from memory) my Amiga 3000 I think was quieter for example than my current office PC, which is a Dell of some flavor, and makes about as much noise as you'd expect, one case fan, one power supply fan, averagely noisy harddrive, just sitting there whirring and whining at me.
It's also possible that my toleration for noise is going down over the years! I think I've always liked the idea of quiet equiptment though, my original computer (Atari 800) was absolutely quiet because it had no fans or harddrive, but the TV it was plugged into did whine with that high-pitched TV whine thing, which still bugs me to this day. But my current monitor is an LCD and does not have that whine. So I'm very much closer to a level of quiet I never did have, a totally quiet PC. And it should even be able to run Amiga software (quietly) through UAE. It's a nice situation, I think, Amiga software, even my old Atari 800 software, and using BeOS as my current OS. There, computery heaven :-P
Erik