One of the other pistols I bought when I went shopping was a Smith & Wesson 4040PD, which is a fairly rare scandium-aluminum alloy framed gun from the S&W 3rd generation of semiauto pistols, very similar to the 3913 and 3913TSW but bigger caliber and without the accessory rail of the latter.
Who cares about the accessory rail on a real CCW gun? It's a little retro gun with big features and a lot of oomph behind the bullet. It was designed for concealed and backup carry and it excels at that, was popular among FBI agents, and you don't want to be on the wrong side of the barrel in a fight. Good enough for me, and it holds its value.
The content of the scandium in the aluminum matrix is less than 2% from what I have read, but it makes a difference in the structure of the metal particularly where the slide rides. Same reason bicycle manufacturers use it. I bought this gun used and the slide-frame interface is tighter than the one on my new SR9. Plus, I love the little atomic glyph on the left side of the frame. How cool is that?
I don't mention it here very much, but I like it as much as my SR9 -- for different reasons. Hogue grips, low-profile Novaks, black finish, and it feels great in the hand. You can balance this pistol perfectly on the middle finger underneath the trigger guard, and it shoots beautifully, particularly for a compact .40. I use the 4040PD as the CCW weapon and I prefer it in that role over the SR9. The plastic frame on the SR9 wasn't the primary reason I bought it, it was the feature set, and when I saw the 4040PD I knew I had to have it also. If anything it feels lighter than the SR9 probably because it's more compact.
I like this little single stack .40 a lot, and I wish Ruger would make something comparable, with an all-metal frame:
http://www.gunshopfinder.com/smithandwesson/smithandwesson4040PD.asp
I'm kind of halfway retro and I actually think about buying a revolver as my next purchase...
Finally, I have to say that I did choose this pistol before Ruger had introduced the SR9c. If one of those had been on the shelf that day, the story might be different, but after having learned a little of the history of the 4040PD I'm almost glad the SR9c wasn't being manufactured yet.