I am new to this whole pistol world having purchased my 1st handgun just recently. I purchased the MOD 2 9mm with the 4" barrel. I now am looking at the XDs for my CC and have various opinions and suggestions on the right caliber. I have shot all 3 versions and feel quite comfortable with recoil from the .40 and .45 but am still unsure what the best approach is. Any suggestions would be much appreciated.