I've used just about every major manufacturer of IDE drives out there..and quite of the few SCSIs.
I'll go with the majority of the other posts. IBM has been producing "quality" and always competitive performing IDE drives since it started focusing on that market with their Deskstar line. I still think their SCSI drives are of high quality as well, although they are not the best performers.
WD - One of the only drives I had a serious complete death(no warning signs, no nothing just died)was a WD digital Conner IDE. I'm not saying their quality hasn't improved. I just think the drive's true face shows over time.
Maxtor - I just can't bring myself to use any of the newer drives they have come out with that received so much press, because they produced some of the crappiest low quality drives in the early 90s (yet still expensive). Again, one of those manufactured drives where I'm afraid it's true face might show over time.
Seagate - I haven't used their higher end IDE Barracuda drives. I've used a lot of their Medalist drives and they reak in quality and performance (but they are cheap, so what do you expect). The Barracuda IDEs might be ok, but they will not perform up to the IBM. And I think they are a company that still puts a lot of their focus on the SCSI market. (So does IBM, but they have more resources to do so. And while Seagate SCSI drives tend to outperfrom equivalent IBM SCSI.. I still think the quality of IBM is better, which just reinforces my belief that IBM puts out the best quality and when looking at IDE they are putting out the best performers as well).
Quantum - I like their Fireball IDE drives, but they just tend to run a little hot and LOUD. Quantum definitely rules in the loudest drive category for IDE and SCSI. And though they are decent performers and I've never had a problem with em, they're still not to IBM's level. Did I mention they were loud?
Fujitsu - I've used some of their older 5400 RPM drives. They were reliable and they were quiet. Performance was par or sub-par and I think they're newer drives will follow suit.
Samsung - I haven't used any of their drives they've thrown into the market. But you will find em.. Reviews of them are usually sub-par performance. I have no clue on reliability. Wouldn't be surprised to see Toshiba get into the fray..
"BIG TIP: To keep your hard drive more alive...shut down your computer daily/overnight or at least HD power down to save the life of it... it only has so many hours and more its used...more it wears and tears (bad clusters/sectors, slower)"
I'd like to comment on that, maybe have you think about it. I think a lot of people who are knowledgeable about hardware will disagree with it. A hard drive not including easily replaceable fans is the only moving part in your PC. And although all parts can suffer from what is called thermal stress, the hard drive suffers the worst from it. This is the process of heating something up so that it expands and cooling it down where it contracts. Now drives are designed to work within a certain temperature. In a good ventilated system, they're should be no problem operating it within that temperature range. So if I had to compare which does more wear and tear.. that being spinning a drive up daily from 0 to 5400-10000 rpms and heating it up from room temp to 35-50 deg C juxtaposed to running it constantly at it's designed operating temp, I would say the former and not the latter. You used to find MTBF as the main reliability rating for almost all drives. I now see a lot more of start stop times. It's shift in what's important. Who cares how long the drive can run if the major factor in it's lifespan is how often it's started and stopped, which is what the average user does. Funny I still see MTBF used alot on SCSI drive specs where SCSI drives are used on systems that are not constantly shutdown and restarted. And the mentioned WD drive that just failed ..was on a system that was "daily" shut down and booted again the next day. A drive may have only so many hours, but today's drives have an MTBF of 800,000 to 1,000,000 hours (that obviously not accurately tested, but if they would stamp it in the specs, manufacturers are probably confident in the drive's ability to run mores hours than you could use) .. and you used to get retail with 5 yr warranties. Means IBM is guaranteeing my 9LZX running constantly for 5 years.. is warrantied. I think they are confident it can handle that. Moreover, the shorter warranties on IDE drives and the shift to start stops means they aren't as confident it can handle the amount of spin ups the average hard drive on a desktop has to go through. There's a lot of individuals that would probably agree that your hard drive will suffer less if you just leave it running all the time.