I always like Western Digital. I had to RMA many drives from them, but I always got swift and excellent service.
Last week, I had to RMA a 320GB WD3500AAKS. I had it for a few years, but it was still under warranty.
Today I get back a 500GB WD5000AAKS Caviar Blue
I had this type of thing happen before, but this is the first time it happened while in TF