WD Caviar Blacks are very good and fast. WD's Green line are a little less expensive, a little slower, and use less electrical power. The "slower" part is not enough to affect your uses significantly - the Greens might bother gamers who demand the ultimate in speed. Among their large-volume products, WD's Blue line is their lowest price, slowest line.
Seagate are also a major supplier, plus others. Look around the web for reports of reliability. Some people much prefer one brand over another on that score.