I always liked the 10mm (two Delta Elites and one Auto Ordnace). I could never tell they recoiled any harder than a regular .45, although they were supposed to be terrible.
At one time the .40 looked like it was going to take over the cop market but seems to be fading a little.
I'm waiting to see how the Urinal/Constipation and the other local media spin this one to favor gun control.