I have loyally purchased Seagates since I've first started buying hdds, and I've never had one fail on me. I've started getting WD Greens for storage, though, because they're cheap and run cool.
In my (admittedly, rather limited) experience, any of the big-name brands is fine; the particular drive matters much more. In particular, when any of them announces a new drive with larger storage capacity, it tends to die on people much more than I'm comfortable with. My general rule is to buy a capacity or two lower than the high point (better pricing there, anyways), and not get anything with less than 30 reviews and a 5-egg average on newegg.
Now, if you want to be extra-sure, you should buy drives from several different lots (or manufacturers, to be safe), so that if there is a defect common to all the drives from a certain factory, for instance, you'll only lose one drive, and be able to rebuild your RAID array with a fresh drive.