Seagate: Quiet motor, but not completely silent seeking. Not loud by any means, but not the quietest either when seeking. The problem is that it's not a very fast drive IMO.
WD: The SE drives are about the quietest and fastest drives when you get a good one. Both seek and motor noise are very low. However.. I have one WD that just screams like an air raid siren. It works fine, but it's loud. I'm going to RMA that drive. The other identicle drive that I have though is dead silent and fast. It's amazing that they are both the same drives.
Maxtor: About middle of the road on noise and speed. Probably splits the difference between the two. I can hear the motor and can hear it seek, but it's pretty quiet when you get a "good" Maxtor. I do have a 40 gb Maxtor right now though that I'm about to RMA that is even noisier than the bad WD that I have. It has fluid bearings too. The drive checks out fine, but it's loud! I'm so glad that Maxtor has "excessive noise" for being one of the reasons why you want to RMA the drive.
Quantum (older Quantum before Maxtor aquired them): It's a fast drive, but not quiet by any means. The motor noise is average, but the seek noise is incredible. The thing literally sounds like a noisy toilet flushing. I thought that it might just be my drive, but I just bought a used drive just like it and it sounds the same. The sound is not nearly as objectionable as the noisy Maxtor and WD I have though.
Samsung: I don't have any experience with the newer Samsung drives. I hear that the newer one's are supposed to be quiet though. My older Samsung is about average on speed and noise. This is a replacement for the first one that I owned. The first one was the only hard drive that ever died on me. I just woke up one day and the drive wouldn't work. I lost everything. This was back when the best data backup was either a tape drive or a 100 mb zip disc.
Fujitsu: Never owned one. You should read about the class action suit brought against them because of their faulty IDE drives. No wonder why they are going to concentrate on SCSI drives from now on.
IBM "Deathstar": I remember when the Deskstar drives were all the rage for speed and price. A lot of people bought them and everyone that I knew that had one eventually failed on them. I'll probably never own an IBM drive because of it. Their market share with drives right now tells the story..
What else is there?
My advice is just to get any drive that you can get a good price on and back up your stuff. Any make and model of drive can go bad on you. Any drive can get noisy, so it seems. I can tell you that in the past, I bought the WD SE drives because of speed and bought the Seagate drives because of low noise. My approach now is to buy the drive that I get the best deal on because it's not that big of a difference if you get a "good" drive.
.02¢
Sal