I've got a G27 and a S&W 342PD. From my experience so far, these are 2 tools for slightly different scenarios. The 342PD is awesome as a pocket carry and I easily forget it's there. The G27 is great on the hip, although I have to be a bit more cautious with how bag my shirt/coat is to cover it up.

If it were me and you already had a semi-auto, I'd get a light revolver for the summer carry.