I have all 3 in PC's in the house now, so I can say with out a bias view.
My Seagate (80GB in my PC) is quite load, but is fast and has been reliable. I did blow up the original seagate hdd (it caught on fire when I plugged it into a friends PC that had a generic PSU.) I recieved a new drive in 5 working days, where it was shipped to another country, and couriered back. Very pleased with that.
My WD (250GB In my PC) is the most silent drive I have used, it literally doesn't make a noise when on full load, it is faster than the 80GB but not by a large margin that is expected by having denser platters. It is also a wierd annodised black one. But I have used WD before and the build quality was shocking and they were not as quiet.
Maxtor (160GB in my brothers PC) drives have been reliable. I only use them where they are considerably cheaper and am on a tight budget. They are of medium volume and speed.