As much as I love my Colt Officers acp, and I carried that thing on the job for 20 years,my HK usp 40 is probably the best out of the box semi I have ever owned. Accurate, built like a tank, can carry it like a 1911 all make it the best.
Best: G23. Hands down.
The one I like the most: FNP. I like it even though it is SA/DA. The Ruger Security 9 is rapidly finding it's way into my heart, but I will probably never get the round count, combined with everything I have to match the G23.