The ammunition that is absolutely reliable in your gun and that you can shoot reasonably fast and accurately is probably the best for you. All the major US manufacturers - Winchester, Speer, Federal, Remington - make good products. I suggest 230 grain loads using one of the law enforcement lines from one of these manufacturers.
Winchester does not "officially" sell their Ranger T line to non-LEOs, but you can find folks on Glock Talk and Warrior Talk forums that will. Also, I think Florida Bulllets will also sell Ranger Ts to non-LEOs. Nothing illegal about this ammo in most states - simply a marketing ploy by Winchester to set apart their LEO ammo from that available to us lesser mortals.
regards,
Steve