If you can get a CW45 for $350, buy it. I carry a CW45 regularly, and haven't had any problems out of it. The CW45 loaded with 7 rounds weighs about the same as an EMPTY Glock 30. (Kahr 27 oz., G30 26.5 oz.) The Kahr may conceal better for you under a light cover garment, depending on body type. The Kahr is much thinner, but the grip is a hair longer than a G30 grip. Seven round capacity vs 11 round capacity, but spare mags for the Kahr are flat and easy to carry.
Either one will serve you well, but the G30 is a little fat in the grip for me, so I prefer the G23 for my Glock, and leave .45 duty to my CW45 or M&P 45.
I bought the CW45 for the size. Mine went back to the Factory due to unreliable operation at the range. When i received it back it runs flawless. I like it easy to carry and almost small enough to fit in my pocket.