The black model wasn't released until after the second Revision AFAIK/Remember.
Correct me if I'm wrong.
Also, it's highly unlikely that any of the first revision cases are left. They have been phased out for several months. I haven't read any report of anyone buying a first revision case from a major retailer or B&M in at least a few months.
There are already threads about this if you search.
Rest assured, it's highly unlikely that you will get an old revision case.
Edit:
I looked into it, and my memory was half-right. The black model was originally a special model only branded to SPCR (who helped design the case)
Here's info on the new revision FROM Silentpcreview.com:
"POSTSCRIPT: V1.1
June 15, 2006 by Devon Cooke
Time passes and products evolve. It's been almost a year since the P180 was first released to much fanfare along with SPCR's longest review ever (in three parts). Antec has finally released the black model of the P180 to the general public (previously, it was an SPCR-exclusive product). At the same time, they revised the original P180 to address several minor issues that arose after the case was released:
* The VGA duct has been removed entirely.
* Vented PCI slot covers have been added to improve airflow around the VGA cards.
* New fan clips that allow a 120mm fan to be mounted directly in front of the VGA cards are included.
* The power supply channel is now cooled by a standard Tricool fan; the original 38mm thick fan is gone.
* The silicone padding around the power supply frame has been improved.
* The front door is now made of the same 3-ply material that is used in the rest of the case, resolving warping issues with the door.
These changes are minor and do not warrant another full review. However, they do affect my original conclusions about the case, especially where the VGA duct is concerned, so it is worth giving them a quick look.
My biggest criticism about the original P180 was the fact that the VGA duct was noisy, ineffective, and complicated installation. Using somewhat strong language, I advised users to avoid this particular feature: "I cannot think of any configuration where I would not remove the duct entirely." Apparently, Antec (and SPCR's editor, Mike Chin, who helped design the case) was listening. The VGA duct has been dropped entirely in favor of a much simpler and, hopefully, more effective system."