scubabrn:
I've written and rewritten this reply now three times and I realize that no matter how diplomatic I'd like it to be, I'm still probably going to get flamed for it. So here goes...
Despite the fact that both my wife and I are PADI instructors, we have come to recognize over the years that many of our friends who have qualifications from other agencies are not as ignorant as we'd like to believe :11:
My wife completed her 2-star and nitrox certs with a CMAS instructor who happened to also be one of the team members on Nuno Gomes' (the guy that set the world scuba diving record at 318.25m in June, 2005, at the Red Sea) technical team. His courses for both her 2-star and nitrox was way, let me say that again, waaaaay more comprehensive than the PADI off the shelf course would ever have been on it's own.
I also have had some of my training from an IANTD instructor who've also done some pretty interesting things in his lifetime, and courses like my nitrox specialty turned out to be a whole lot more comprehensive despite the fact that it was still cert'ed as a PADI course. The point I am trying to make is that you might want to look past the certifying agency and look at the guy/gal doing the actual teaching part. In the end you might still only have the PADI/NAUI/SSI/etc cert card, but what is of greater importance is the actual *proper* understanding of the subject material you got in your head, and the experience you gain from applying that knowledge. Find a *good* instructor who will teach you *well*, and the label you have on your C-card won't matter, besides perhaps keeping the dive resorts happy that you are indeed certified.
My intention here is *not* to

off other die hard PADI professionals or anything, we're proudly PADI supporters too, hot damn I invested enough money to at least own some shares I'd recon! I am just saying that our courses were taken to a whole new level by our higher qualified and better experienced instructors, they still included all the PADI requirements - trust me I checked them up in my standards and procedures - but they expanded on the subject far beyond the normal scopes. They brought a whole plethora of information and real world experience to our courses that otherwise would not have been taught in an off the shelf course from your LDS by a PADI OWSI without any other background.
Now give me a minute to run and go hide behind a wall before you start shooting at me okay!