Quietest 500GB Firewire drive?

I'm researching external drives for my music room (Firewire drive > PowerBook G4 > [USB DAC when I have more $] > Arcam FMJ). I want it to be as quiet as possible. (I would be very happy if it were as quiet as the PowerBook.) I have an older Lacie Big Disk in my office and, even though it is fanless, it isn't sufficiently quiet for my music room (I can hear the disks spinning and electrical hum).

Here are the drives I'm comparing so far:

- LaCie d2 Quadra Hard Disk
- Western Digital My Book Studio Edition
- Seagate FreeAgent Go for Mac

Can anyone speak about their relative noise levels? Lacie tells me the Quadra is much quieter than my older Big Disk, but I would like to hear from actual users.

Thanks!