1. None are bad. For quiet, Samsung or Seagate. For performance, WD or Hitachi.
2. DOn't get a 120GB. Get a 160GB. Better GB/$ for 160 and 200GB drives.
Notes: PATA Seagates currently are in low performance mode, and SATA ones are in high, no way to change it.
I have a Spinpoint 160GB 2MB, and Varun is about right. With the case open, I can hear seek noise...with the case closed, nada; and in both situations, I cannot hear motor whine if I am more than a foot away from the drive. However, Samsung uses different motors, and apparently the JVC ones are louder.