If you're looking for something extra reliable, I'd
go with Seagate or Hitachi/IBM...Samsung seems to have
a good track record with their recent drives too (and
quiet at idle, no "whistle" and retarded "head protection feature"
noises like the 7200.7 Seagates).
Seagates do rank (relatively) poor performance wise, though...
WD's are the fastest, but noisy and "may" be more prone to failure...
Decisions...;-)