To sum up almost every 9mm thread on the internet:
Avoid 115gr and anything lighter, especially the standard pressure stuff. Make sure whatever you choose shoots reliably in your gun.
I would add that many people advise to practice with the same bullet weight as you carry. Since almost all of the cheap practice ammo is 115gr, this may be a factor for you. Personally, I don't notice enough of a difference between 127gr & 115 to worry about it, but I haven't really tested 147gr yet.