Yes! Yes! Yes! Especially if you want a great carry gun in .45ACP. Otherwise, trade your Ruger for an S&W Shield in 9MM. I have both. I REALLY like both. I fully trust both, from a reliability, shootability standpoint as well as a personal protection handgun that is easy to carry every day, all day long. I am NOT a novice, but I am not you. We are all different, have different needs, and find that different handguns work best for us. You need to shoot both, the Shield 9MM and the Shield 45. At a very minimum, you need to hold each of them, dry fire them if allowed, and get as familiar with them as you possibly can before you make your decision.
Regardless, in my humble, very considered opinion, there is just no comparison between the Shields and the Ruger Sr9c. Perhaps the only other suggestion I might have would be to also investigate the compact versions of the MP9 and the MP45.