Hi Mike,
Hard drives are much of the same really, horses for courses so to speak, you will hear reports of people recommending one hard drive and others who are unhappy with the same brand of drive.
If you are concerned that you may lose your photo collection through drive failure, I would recommend perhaps also backing up your photo's to disc - DVD preferably, especially if your iMac has a superdrive.
You can back up to normal disc but you may find you use a lot of discs - in the long run it may be cheaper to invest in an external DVD RW drive if your iMac does not have the superdrive.
Then you can store your archived DVD discs away until you need them - and every couple of years or so, test the discs to make sure the dye has not delaminated and copy to a fresh disc when necessary.
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