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If you have an XD sub, I would say you already have a great primary carry gun and there a tons of holster options for it. I would start by finding a good BUG. The ruger LCP and KelTec P3AT are both excellent choices that are almost invisible with any clothing. In hot weather, I find myself carrying only the kel tec a lot of the time. There are also a lot of options when carrying a pistol this size, I have IWB, pocket, and ankle holsters so I can change to any configuration that a situation requires.
Once the BUG problem is settled and if you still have the itch for a new primary, take a serious look at the 3-4 inch 1911's. A really good one with all the bells and whistles are a little pricey but there are deals to be found. Fire a decent one and you may find yourself a convert. (That's what happened to me.)
If I had to get rid of all my pistols but 2, I would keep my KelTec P3At and my Kimber Ultra CDP.
One last thing on the BUG though. While I have zero complaints with my Kel Tec, I have fired a couple others and have heard reports from others that some of them have much tighter trigger pulls than mine so, check the trigger pull before you purchase one.
Happy shopping.