Seagate and only Seagate. If you're buying cheap, consumer level drives, Seagate makes an "ES" series that has a mean time between failure of one million hours. Longer than any other consumer level drives.
I deal with literally thousands of drives every day (and regular failures). I will only allow groups to order Seagate drives due to the high failure rates and irregular failure modes I've seen with other brands. The worst, in particular, is Maxtor.