Personally I'll stick with Samsung. We found a failure rate of 1 in 50 drives making them the most reliable drives we have tried. They are also virtually silent which is reflected in them being a recommended product at SilentPCReview. See http://www.silentpcreview.com/article29-page1.html for more details.
We found an average failure rate of 1 in 35 Seagate drives we used in systems. Western Digital wasn't much better.
Hitachi's reliabillity has carried over from the IBM DeskStar drives they are based on, horrendous. Fortunately their performance is still top notch. They're about as noisy as the Maxtor drives though.
Maxtor's reliabillity and performance is, as always good. They are far too noisy for my taste.
When it comes to drive noise, the only two options are Samsung and Seagate.
The thing to remember is that historically, Samsung only made high end SCSI hard drives. Now that they've started making consumer level drives, their experience in making high performing and reliable drives seems to show. This explains why they're such an unknown brand with consumer hard drives to most people. They also offer a 3 year warranty on all of their hard drives as standard.
Ignore any synthetic benchmark results, the only results that matter are the real world tests.
AMD AMD Phenom II 955 BE w/ Xigmatek S1283 Red Scorpion HSF, Gigabyte GA-MA790XT-UD4P MB
8GB DDR3 1600 G.Skill NQ RAM, 64GB G.Skill Falcon SSD, 1.5TB Samsung Silencer Series HDD, ATI Radeon HD4850 w/ AC Accelero S1 Cooling + 92mm fan
Coolermaster Sileo 500 Case + Corsair HX520W Modular PSU
Whisper Quiet Computing.....