Hmm... I have a couple of that server out there in the world running W2K3, but I can't say that I've had to DR one back from bare metal.
For starters, I'd consider booting once with boot logging enabled (it's a choice in the same pre-boot menu where you'd choose "Safe Mode"), then boot to the recovery console (or better, a W2K8 / Vista / Windows 7 setup CD so that you get a "real" command prompt) and have a look at the "%SystemRoot%\NTBTLOG.TXT" file. There's a chance that seeing the last few driver loads might give you somewhere to go.
I'd consider doing a "Repair" install of Windows on top of the restored installation, but that's ugly and messy and only something I'd do as a last resort.
Keep us updated re: your findings. If you get more information, drop it in here and I'm sure "the community" will share its thoughts. I know I will.
If your temporary operating system reinstallation was into the same directory as the original install (i.e. both in "C:\WINDOWS", etc), then the registry containing your temporary installation has already been overwritten by the restored registry, and as such, the directory services restore mode password you set during your temporary install is gone and should not be a factor.
If you did a "Repair" with an RTM CD and the box was SP2 at the time of backup that may account for the STOP 0xC0000021A that you're seeing right now, but I'm not sure. It might be worth it to get a slipstreamed SP2 media and try a repair from that. (If you don't have one you could use a tool like nLite to build one. Hopefully you've got a CD burner and some blanks handy...)
You've got me interested to the point that I may try and take down one of my Customers' PE430SC's, throw a scratch drive in it, and try a bare metal restore. Of course, that doesn't help you tonight (and I'm guessing you're trying to get this going for Monday morning).
Since you haven't RAID'ed the disks yet you might try setting the current disk you're playing with aside, throwing in the second disk, reinstalling Windows one more time, and doing a restore of just the %SystemRoot% and "Program Files" directories again, just to see what happens. Before you restore the box you could apply SP2 just to see what happens. (You might take an image of the box in that state, too, assuming you have some software with you to do that, just so you won't have to reload Windows AGAIN during this whole fiasco.)
You've got me a little bit stumped. I've done a goodly number of bare-metal Windows NT / 2000 / 2003 recoveries and I can't say that I've seen what you're seeing.