Regarding the Hitachi disk, there's a review here
which you might find interesting.
It's of the Ultrastar A7K2000, the bigger brother of the Deskstar, but also mentions the Deskstar.
Regarding reliability, the reviewer notes that the Ultrastar has a rating of 1.2 million hours MTBF (Mean Time Between Failures), while the Deskstar is unrated in this department. And the Ultrastar gets a 5 year warranty versus 3 with the Deskstar... other issues of slightly sluggish real world speed are raised.
I've always liked the Spinpoint drives myself, although I don't own a large capacity one unfortunately, my small sized drive has lasted for several years with no issues....