I wreestled with which way to go too, but went with 9mm for the reasons others have stated. Prior to the Shield I was shooting 38/357 from a 6" Ruger GP-100, and had a lot of fun shooting powerful, blasty, and smoky 357 rounds. .40 cal costs about the same, more or less. 9mm costs quite a bit less and the savings in a year are substantial (I shoot 2x per week, normally).

I will likely carry either Speer Gold Dot 124 +P or Federal P9HST3 124 +P - and both are a lot of fun to shoot in the Shield.

Tommato