I use whatever has a reasonable (3 yr) warranty and is on sale when I need a new drive. Currently that means both Seagate and WD drives. I used to buy Green* drives because they were quieter but now that I put the workhorse system in the garage a few years back, I buy fast and cheap. I've had bad luck with 5400-rpm and 7200-rpm intermixed in a RAID-5 (for what I imagine are obvious reasons - I'm lazy, what can I say?)
I've had drives of all manufacturers fail: Seagate, WD, LaCie, Hitachi, Fujitsu, Winchester, you name it, it's died, and often spectacularly. Recently I've had SSD drives fail as well; it's a fact of hard drive life, whether it spins or doesn't.
I've taken advantage of the return policy for WD and Seagate many times, and they seem to work pretty much interchangeably. Their policies vary, but both have a "quick replace" policy if you can float the cost on a credit card.
Drives are expendable; you need to consider them to be basically interchangeable and prone-to-failure, and everything resolves itself after that. As drives get larger and larger, the "stakes per drive" increases (that is, the potential loss per spindle is much higher).
My least favorite failures were in the "$1000 / GB" days (approx 1995) when a drive that could hold an ENTIRE GB was about the most expensive thing I could possibly imagine. Those were really painful days because the backup strategy was zip disks or, gulp, floppies.
Have backups: I have a large software-raid for cost-effective performance, and a couple of 2+TB USB drives for interchangeable backups. I *never* let myself have only one copy of anything, and most of the time, I have three (on system, on another disk). The crucial things I keep on Dropbox in addition (for a total of four copies).
Having to tell my wife that I lost all of the kids digital pictures, etc. because a drive failed is not a conversation I ever want to have.