careful with those words. Some people around here are super touchy about their fanboism for the m&p...
and with that- I suggest you try out the trigger jobs before you buy in. There are quite a few differences between them. I have a Apex'd m&p 9mm that you can spank all you want and decide if it's for you. PM me if you want to hit up a range sometime. I'll be at the Comm2A shoot, too.
FWIW- I did the Apex kit because I didn't have the time to mess with a gunsmith since I am my own nightmare when it comes to gunsmithing. But if you go with Santurri, or Derr- they will get the trigger to exactly how you want it to feel. Want a 3 lbs pull? They'll get it there.