You know, I like .40 best, but I appreciate and support your request. I think departments should allow officers to carry guns in the 4 major calibers (9x19, .40, .357 SIG, .45) and from a decently wide range of quality, high capacity, modern design pistols. (Glock, Ruger, Springfield, Beretta, Sig). The MOST important criterion ought to be officer comfort and skill with their weapon.
As much as it makes me sick to say something positive about ground zero of anti-gun corruption, I think Chicago PD has it right.