I just did almost the exact same thing. I just got a SR40C a little over a month ago (first handgun Ive owned for a few years). I was hooked immediatly and loved shooting it. Then i figured out that its kinda pricey to shoot as much as I wanted. Then I figured I needed a .22 not just for the cheap shooting and good practice but also as a gun for the wife. I got an SR22 and couldnt be happier with it and the wife likes it too although shes only gone shooting with me once.
Also, a big reason I got the .40 is because I want to get my CCP soon but now ive decided its too big for me to feel comfortable carrying (just starting). So last weekend i picked up an LCP at a gun show, like that one too.
Sorry about the story, but anyway....yeah the SR22 is a good gun. I was looking at the Walther also but went with the Ruger because I liked the SR40 so well.