Just to throw out another option other than Ruger or Sig in this category, have you looked at the Seecamps at all Eagl? A lot of guys I worked with carried them as their secondary or tertiary pistol backup, and SWEAR by them. They are expensive, at least the .380 is relatively speaking at 800$, but the .32 can be found for under 500$ USD on the net from time to time.
For a tiny pocket pistol you can't go wrong with that Sig, the Ruger, or the Seecamp IMO, it just comes down to cost, how it fits/shoots for you, and personal pref.