seagate ^^^, hitachi is also good. Samsung i think isn't too bad. I'd probably take all those drives, on a reliability basis over WD or Maxtor. (Samsung I'd do some research on, but they tend to make good stuff). If you wait on places like bensbargains.net you can often find something like 160GB seagates for $50-$60. Worth the wait, if you're not in a rush. OTOH, I wouldn't use a drive that big for my OS (or I would partition it.).

edit: btw, I have that samsung drive right now after a couple of year's of use, and it seems to be dying on me (had since june 02), so maybe I should take that back.