I own and have owned several handguns. I now use mostly XD & XDS. I have 9mm in XD and .45 in an XDS and a Kimber Ultra Carry. I want to maintain one platform to enable optimum response in a critical time. So, I may trade-in the Kimber for another XDS (I have had my other one updated by SA and love the way it fires). I am open to recommendations on maintaining one caliber to maximize usability between pistols. With the smaller XDS I have always felt that it is going to be used in close quarters and the .45 would be more forgiving of an off-core hit and cause more damage and subsequently, stopping power. Thoughts on remaining .45 with XDS or moving to one ammo; 9mm? Thanks.