Want something easier to conceal that's a lot like a Glock? Walther PPS. Same striker fired design. Almost identical trigger action, except the PPS has very little over travel. Accurate. Easy to conceal. Low recoil.
This is in no way a knock against Glock either. I have the G27, G23, G17, and G21. I have had others. These are some of my favs. To be honest, I carry the G23 more than the G27.. but when I am more concerned with concealing, I'll pick the PPS.