What hard drive to purchase?

I need to replace the internal hard drive on my 20" iMac G5, which has become damaged. I've removed the hard drive, but don't know where or what to purchase to replace it.  The computer other than that works fine. I can boot from a CD or in Target mode from my Macbook. I've had no success figuring out how to get an external drive to be the start up drive.
I was running the latest version of Tiger when it crashed and did manage to backup all of the data on it using Disk Utilities Restore function to an external hard drive.  Disk Utility, nor Disk Warrior were able to repair the internal hard drive.

If you have an external drive now (that you can erase), and it is FireWire, you can install a system now and boot from it (until you replace the internal drive).  In fact, if you used the Restore tab in Disk Utility to duplicate the internal drive to the external drive, you may already have a bootable system.
So, if that external drive is FireWire, connect the external drive to iMac, power it up, and start up iMac with the Option key held down.  This will give you the Startup Manager screen, that lists your startup disk options.  If one of them is the system on the external drive, select it and continue the startup sequence.  Since it's a duplicate, it should act like your main system on the internal drive.
As for the replacement internal drive, the iMac G5 has a 1.5Gb/s SATA interface.  A 3.5-inch 3Gb/s SATA drive should be compatible, which is a common type.
If you start here at OWC's web site
http://eshop.macsales.com/MyOWC/?StartOver=1
you can identify your iMac model and the type of "upgrade" you want.  The site will list compatible products, in this case hard drives.  You don't have to buy the hard drive from OWC; you can look at the specs and models listed there, and do some comparison shopping.  Newegg.com often has good deals on hard drives.
You may want to keep the replacement 1TB or lower (in storage capacity), just to make sure the replacement drive you get does not overstress the old iMac's power supply.

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