First off, anything you get from Sparks is top-notch, custom gear, very well made. Having said that, you may want to consider IWB if you are concerned with
concealment, as an IWB is far more concealable then any OWB. The Milt Saprks Summer Special is a very nice IWB rig, and I carried a Glock 23 in one for many years. It was comfortable and concealed well....but I always felt it there....