I voted for the GP-100 as well.
I lean towards the revolver for a house gun for the simple fact that you can leave it loaded forever without worrying about spring compression in a magazine. When I pull out my house gun, I want it to go "bang" and not "click" because the mag spring is weak and worn out. Now, I am not an expert on spring compression, but my experience in industrial settings tells me it is possible over time. My house gun is a Ruger Blackhawk in .45LC.
I routinely carry a 1911 as my CPL gun (mainly winter), a Sig P250 Subcompact 9mm in warmer weather, and a Ruger LCP. With my carry guns, however, I don't leave the magazines loaded for more than a week without unloading them and giving them a "break". If this is overkill, and I am being over concerned about this, please advise.