Brand New Internal Hard Drive with "disk0s2: I/O error" (iMac 2007/10.6.8)

Hello,
I have a 2007 iMac 21" Aluminum running 10.6.8 with 4GB RAM. Two years ago I had a 2TB Western Digital drive installed, which ran fine until about two weeks ago. The performance of my iMac went down hill fast. At first I didn't suspect the drive but, finally, Disk Utility did start showing errors (including the disk0s2: I/O error).
Today I had an authorized Apple service center remove the drive and replace it with a brand new 2TB drive (a Toshiba, if you're curious). Tonight I booted up and noticed some sluggishness. So I rebooted in safe-mode (holding down the shift key), disabled a few auto-start apps I had, and rebooted. Problem solved.
Now, the computer is performing fine it seems, but I have a (free) menu bar app installed called SMARTreporter version 2.7.3. Since booting it has thrown several disk0s2: I/O errors. Excerpt:
Aug 2 21:45:17 localhost kernel[0]: disk0s2: I/O error.
Aug 2 21:45:47 localhost kernel[0]: disk0s2: I/O error.
Aug 2 21:46:25 localhost kernel[0]: disk0s2: I/O error.
Aug 2 21:49:45 localhost kernel[0]: disk0s2: I/O error.
Aug 2 21:50:51 localhost kernel[0]: disk0s2: I/O error.
Aug 2 21:52:27 localhost kernel[0]: disk0s2: I/O error.
Aug 2 21:53:52 localhost kernel[0]: disk0s2: I/O error.
Aug 2 21:54:45 localhost kernel[0]: disk0s2: I/O error.
Aug 2 21:57:41 localhost kernel[0]: disk0s2: I/O error.
Aug 2 22:00:14 localhost kernel[0]: disk0s2: I/O error.
Aug 2 22:13:05 localhost kernel[0]: disk0s2: I/O error.
Aug 2 22:14:28 localhost kernel[0]: disk0s2: I/O error.
Aug 2 22:15:56 localhost kernel[0]: disk0s2: I/O error.
Aug 2 22:17:16 localhost kernel[0]: disk0s2: I/O error.
Aug 2 22:20:06 localhost kernel[0]: disk0s2: I/O error.
Aug 2 22:22:38 localhost kernel[0]: disk0s2: I/O error.
I will add that I noticed these errors after I work the iMac from sleep and got one or two more after I work it from sleep. But it's been several minutes since I got another notice from SMARTreporter (which uses growl notices, which is nice). The last line shown above is the last diskOs2 error I've seen in the past 45 min. or so.
I know it's possible to get a bad drive, so I haven't ruled that out. I'm just surprised if that's indeed the case. But I want to make sure I know what's going on, and any help would be appreciated.
Thank you.

UPDATE...
I took it into a different authorized Apple reseller/tech (Mac Authority Nashville) and they did a diagnostic on the spot, indicating that the drive was OK. They suggested it was probably a loose cable.
I took it back to the other place and they took time to disassemble it again and check the cables. The cables were fine (they showed me pics on their iPad - nice touch since I couldn't go back in the back). They suspected it could be corrupted data and that I should eliminate that possibility before dropping another $100 on it to find out what the issue is -- especially since it's six years old (this weekend, in fact. I chuckled when Apple said that it's now classified as a "vintage" machine).
Now I have re-installed Snow Leopard and have run all the updates. (Before installing the OS from DVD I ran Disk Utility and everything checked out fine.)
I also ran an app called EtreCheck and it identified some launch agents for apps I deleted long ago. I cleaned up some old files (verrrrrry judiciously) there and restarted.
So far my iMac has been running 3+ hours without a hint of problems or performance issues, so I'm encouraged that the problem is apparently fixed (if I have more trouble, I'll come back to this thread with another update). Appaently I just spent money on a hard drive I apparently didn't need. (Time for a SATA case so I can have a new external back-up...)
LESSON:
It doesn't hurt, usually, to start with reinstalling the OS when serious performance issues arise.

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