Indeed, I was not using the latest driver packs, however I want to say that it might be the chipset drivers causing an issue (the GX620 has oddly named drivers compared to everything else..) which hasn't been updated since Feb (I presume).
I have a few questions before I embark on this quest to figure out what's going on:
1) Are there any log files that I should also look at for information regarding driver changes / installs?
2) Is there a tool for finding / listing out HWIDs?
I'm also going to verify that those versions of the files are causing the problem. Also, my coworker pointed out that Windows File Protection should be off, I'm going to make sure that it is indeed turned off via nLite the next build that I do of the unattended... just to make sure (but once again, I used the same dvd to install on the optiplex 960 and that did not have any issues.. Also the nLite configuration in the DVD shows that the DoSFC is in the nLite configuration file.)
I'm going to try and track this down, as it's really disturbing that a specific model is having these problems with DriverPacks..