My advice would be to stay open-minded to any of the versions.
The BD is the easiest to find compared to the others.
In the several months I have been into CZ's I have yet to see a SA even for sale. That being said I haven't been obsessed with finding one either.
Even seeing a CZ75/85 at a gun show is pretty uncommon.
If you brave enough for Birch Run on Thanksgiving weekend after Obama winning try that and buy any version if you can find one new for under $500.