I have had Maxtor's and Western Digitals fail in the past. I have a Barracuda UDMA 33 or 66 and it's still working. So I bought the Seagate 1TB Barracuda last year. The fact that they have 5 year warranty's also made it attractive.
I built a new system this year and picked up a 500 gig Seagate as my primary and a 1.5 gig Seagate as an additional slave. I figure 3TB was enough for now.
I moved about 500-600 gigs worth of porn onto the 1TB. The fucking drive died 3 months back. I lost my entire porn collection. Pissed is an understatement. It's great that it is under warranty (until 2013), but what about the data.
A year ago I would have said buy Seagate, today I don't know. If you have one of their drives, download their utility software and scan your drive to make sure it is fine. As well back up your stuff.