It seems you like 9mm handguns. Have youtried kahr? They are thinner than the glock and ruger. PM9 or MK9 are the small 9mm models. P9 and the k9 are the "midsize". The T9 is the large model.
I think the p9 is a great gun for carry. It is light and thin.
I used to own a p9 and currently own a couple k40's and a k9.
They can be had used for around $400+ on gunbroker.