The Seagates I've used (2X7200.9 300GB, 2X7200.10 320GB, 3X7200.11 1TB) have all been pretty quiet. The reliability of the 1.5TB 7200.11 drives is a little in question, but the rest have been along industry average. I've had 2 go bad, but those were the 7200.9 300GB drives. (Both died within the first couple months, and were replaced by Seagate quickly and without much backtalk. The replacements are still in use 3 years later.) the rest are still plugging along like champs.
I've heard Samsung Spinpoint drives are pretty quiet, too, but I've had no experience with them.