I have a highly modified Colt Gov. Model and Officers Model and a HK USP 45. All three are very accurite and totally reliable. I bought the HK as a duty weapon. The HK is a great firearm, but the only reason that I bought it was to satisfy the brass with the aditional safety features such as double action, decocker, blocked firing pin etc. Anyone willing to learn the safety features and properly carry a colt style (Kimber) will most likely find it easier to shoot. There is just something about the way the Colt style 45 naturally points. It is like an extention of your arm. As to 7 or 8 shots vs the 10 or 12 in the HK. If you do it right, one mag from the Colt style is all you need. I would go with the Kimber.
Good Shooting, John K