I have a serious delema. I got permission from the Boss (I love her) to get a $600ish gun of my choice. I started out with five models to chose from. I quickly ruled it down to the USP and the Walther P99. My interest is waining on the P99. Now I can't decide whether to get the .40 or .45. I am a big 1911 man so I figured that a full sized .45 is my 1911. I'd like the compact USP, but which caliber. Thanks.