Being the HK snob that I am, I carry either an HK P7M8 or a USP .45 compact.
I carry the P7 in a Del Fatti
IWB holster. If the britches I'm wearing are too small to accomodate an IWB, or I have been too pigish at the dinner table, I carry my USP in a belt holster from Desantis.
I prefer to carry the P7 as it just disappears on my hip under a simple t-shirt. With the USP, I have to wear a bit more to properly cover it up.