Maxtor - Going on number 8 now and have not had to RMA a single one in 5+ years. Just a note if you go with the Maxtor in a retail box... be sure to check and make sure it is a true Maxtor and not a Quantum. This may be old news to the readers in here, but I was told Maxtor bought Quantum. The last Maxtor retail boxed 40g I purchased three months ago had a new 20g Quantum in the box. CompUSA swapped it on the spot.
I think this may be more of a Ford Vs. Chevy thing. I like the performance and feel of the WD slightly more than any other, but for piece of mind the Maxtor is what I lean to now.