I swore off Deskstar drives back in the Deathstar days, after losing 3 in 2 months. After that, I swore off WD and Seagate due to every one I had failing from a 6.4GB Seagate to a 20GB WD. I spent some time with Maxtor, from a 20Gb drive to a 300GB drive, but then they got bought out. I never had issues with them despite others complaining. I then went back to Seagate from my 300GB pair to a 1TB pair. Recently, though, I bought 3 750Gb WD Caviar Black drives, mostly because they were so much faster, and I had heard they improved reliability.
I still don't trust Hitachi or Samsung at this point. I haven't seen any evidence that they improved their reliability. Toshiba laptop drives are the ones I would stay away from the most.
At this point, due to the warranties of various drives and my lack of finding bad drives, I'd say my top is Seagate, but a very close second would be WD.