Okay, the Glock has 4 safeties, 3 internal, one external. The external one is on the trigger, and has been copied by S&W, Springfield (H&K) and Walther. The Glock has no other mechanical safety that the user can operate. Many find this alarming if dealing with a home defense gun and kids.
If you like the feel of the Glock, and like 9mm, I'd go along with the previous recommendation, and grab the compact, Glock 19. 1/2" shorter barrel and grip frame then the G17. I'd stay away from .40 S&W until you find something you really like to shoot. The .40 has some snappy recoil in a lightweight gun.
Otherwise, look into the Smith and Wesson M&P line up. Also, the Springfield xD series of pistols. Both of those can be had with a thumb safety, and the xD also has a grip safety. Both can be had in your price range, as well as the FNH lineup or polymer pistol. The FN 9,
info here, would also be a good choice, and has a thumb safety that's ambi.
Lastly, and this is a pet peeve. Clips feed magazines, magazines feed guns. Those box like things that hold the ammo are magazines, not clips
Call them mags for short, but don't call them clips!