When I was thinking about getting into CAS a couple years back, almost EVERYONE I talked to reccomended getting Ruger revolvers. The consensus was that they'd last longer with fewer problems than any of the other brands. Some of the people had tried Rugers first and stuck with them, while others had tried the various Italian guns before giving up on them and getting Rugers. One guy even switched from new production Colt SAA's to Rugers because he kept having problems with the Colts. (I believe he sold one Colt and have enough to pay for both Rugers, btw).
To Dmftoy1: Yes, you need two revovlers for all CAS shoots that I am familiar with. Find a local CAS club in your area and talk to some shooters for more info before you lay out serious cash for hardware. You should find that they'll be willing to help out a new shooter. You might even arrange to borrow a gun while you save up to complete your gear. (In my experience, their more willing to help you out with a loan for the match if you have ALMOST everything you need but still need that second revolver or one of the two long guns. It's harder to get guys to loan you a complete rig.)