I am about the same size as you, maybe ten pounds or so lighter.
The largest gun I carry now as far as frame size would be the Model
617 snubbie 2" K-frame or the Glock 26. I am just not comfortable
carrying larger frames when I conceal carry, especially during the
summer months where I live. I had thought about getting a Ruger
GP-100 with the 3" barrel for concealed carry at one time, but I
like the convenience of throwing a gun in a pocket holster and
sticking my gun in my front pocket now (the Ruger LCP has spoiled
me I guess). During the cooler months I do carry the 617 and the
Glock 26 IWB with a shirt or jacket as cover.