I'd opt for an Shadow 2 Orange variant if I was collecting. Or maybe one of the first shadow 2 variants that had the different finish (wasn't a blue finish but something like that, I don't remember what they called it?). Or hold out for the next anniversary edition that comes out. Or go with a Tactical Sport Orange and make your friends look like novices at the range! When I go out with my buddy he won't put my TSO down it makes him look good!
Tok beat me to it!!
The mechanical differences between the SAO and DA/SA are subtle. You can convert a DA/SA to SAO by removing the disconnector and installing a SAO trigger. It boils down to if you want a dual action trigger or not? Are you a 1911 guy and prefer single action only? I'm not sure how easy it is to convert a SAO variant into a DA/SA? I don't know if the hammer has the holes for the disconnector or not? You may have to purchase a new hammer, disconnector, and trigger to convert a SAO to DA/SA?
Cheers,
Toby