Western Digital is, by far, the best choice.
In my experience, WD drives last forever with reasonable care. I have several WD drives in older computers, some of which are 10 years old, and they continue to run flawlessly. In the event that a drive does fail (couple of office machines over the years), WD has a no hassles RMA policy provided, of course, that the drive is still under warranty.
The 3-platter 500GB Caviar SE16 is currently the fastest 500GB drive on the market, and it's priced under $150 from New Egg.