I used to loathe WD. I had a total of 8 drives from them all fail (sizes ranging from 6.4 to 10GB, if this is any indication of how long ago it was) realatively soon after purchase. I didn't know that much about RMA or any of the like, but Best Buy was a willing swap-host.
For the longest time, I swore by Maxtor. Then the WD Special Editions with the 8MB cache came out. I had a few extra bucks and nabbed a 120GB for the hell of it. Guess what... now all that I have in my system is WD. I may be crazy, but they've all been rock solid (the two 120's (RAID-0) are over 2 years of near-constant use, the 160 just turned 2 years old last month, and the 2 SATA Raptors (RAID-0) are just... wow. O.O).
As long as you don't get tricked into getting their 'Valuedrive' (5400 RPM with 2mb o' cache, probably made in the same factory and by the same workers as JTS was (not familiar with JTS? They were in business for less than a year. The company was from India, and has a 100% failure rate. Most drives never even lived to be more than six months old))) then you should be fine. The Special Editions are carrying a 3 year warranty, and the Raptors (built from their SCSI line of HDs) come with a 5 year.
At work, I deal with mostly Hitachi and Seagates. I RMA more of those than any other drive. Yes, mechanical parts *DO* fail, it's inevitable. Those drives, though, only come with a 1 year warranty, so... in order to get an RMA, they're all dying before reaching their first birthday. That's just not right.