BigMike,
I have only dry fired the SA model you ask about. The trigger is not as nice as a Champion, but is better than the standard 75B or 85.
I own the CZ75 Champion which is also single action only. The trigger on the SA is the same style as on my Champion. You would be closer to a Champion with that than starting with a stock CZ75B. You may be able to just add the Champion sear and hammer to smooth it out even more without purchasing the Champion trigger. Mike at CZ could tell you.