It really depends on my mood, and if I am at work.
Usually, I carry Winchester Black Talon or Silvertip, but I also have Federal Hydrashok and RUAG Action4. Action4 was specifically developped for Police use, and has quite nice stopping power.
When at work, I usually have to load Action4 or plain FMJ (Army).
But I actually have to say, that I think it's crap, that as soon as you serve your country in the Army, you have to use plain FMJ Ammo. All you Americans should understand that best, cause when you are in the Army, and even in Iraq or A'stan, you are bound by the Geneva Conventions, which prevent you from using that ammunition, that could save your life best.