Dang, I can't find the Nationals line count.
However, DA/SA autos are a minority vs Glocks and 1911s, but they are there. I have shot IDPA SSP with a CZ-75 and will be working up a P226 but I am definitely swimming upstream.
Some guy name of Ernest Langdon has shown that both Beretta and Sig-Sauer can win. The DA to SA "crunch-tick" can be mastered. And after all, you only have to do it about a half-dozen times a day at the typical club match.
The guns can be improved by judicious gunsmithing... which Langdon also provides.
http://www.langdontactical.com/
Cheap ammo and a new field to explore. What a wonderful excuse to buy a new gun.