STI has models approved for sale in CA, but hasn't shipped any since December of last year due to potential litigation. The Edge in .40 and Trojan in .45 are what are approved (with "CA" in front of either).
The only way you're going to get your hands on an STI is by finding one for sale at a local USPSA match or on one of the gun forums or selling sites. If you just want to try an STI, go to a USPSA match and ask.
Yon can still get a new SV in CA, either a single stack or a widebody. Both will be a .45 with a short dust cover. Check out www.speedshooter.com. They say if you want it in .40 they will install a .40 barrel and breechface.