For strictly a HD gun that you're not going to try and conceal - your options are pretty much wide open. Some feel that for familiarity reasons you should stick to one gun or one type of gun for both.
I personally use my Glock 39 for both ccw and HD, but that's basically because its my only practical choice for HD for the current time. Actually my ideal HD gun wouldn't be a pistol at all. It would be an Remington 870 with an 18" barrel - Fixed Cyc or I/C choke. Magazine extension - some sort of tactical stock, sling, with a light.
I personally use my Glock 39 for both ccw and HD, but that's basically because its my only practical choice for HD for the current time. Actually my ideal HD gun wouldn't be a pistol at all. It would be an Remington 870 with an 18" barrel - Fixed Cyc or I/C choke. Magazine extension - some sort of tactical stock, sling, with a light.