IBM or Seagate.
I've never had a problem in terms of noise with the Deskstars. I own 6 of them and they are extremely quiet. I bought one of the Seagates when I was in a jam for a HD and was pleasantly surprised that these drives are also pretty quiet. I was fairly reluctant to by the drive since the last Seagate I owned sounded like a box of rocks anytime the the read/write head started moving.
Dick