Trigger Upgrade

Who makes the best trigger for 1911?

When you say trigger do you mean the actual part that you put your finger on?

Yes, I would like to upgrade my trigger there is a little slop in the factory one.

read this
http://www.brownells.com/aspx/learn/learndetail.aspx?lid=10297

or watch this
https://www.youtube.com/watch?v=Fx_4g8MOKHg

there is no such thing as a 100% drop in trigger

I'm still not sure what you are asking for.  If you are trying to change what you feel when you pull the trigger, that is going to involve stoning of your hammer hooks or sear, and like dronning said, you just can't buy some parts and expect a miraculous improvement.  Stoning the hammer and sear incorrectly can give you an unsafe gun if you do it wrong.  If you are just looking for a different one of these parts that's easy:

Cylinder and Slide makes "drop in" trigger kits that are supposed to feel good right out of the package, and I'm aware of some kits that were really good and others that have a little roughness in them--but never a kit that was bad enough to get the person to send the kit back or exchange it.

Bullseye pistol smiths exist because of the difficulty in mastering the skill to make a trigger feel just right.

there are no drop in triggers, being you have slop, you need to just have a good gunsmith fit a trigger to the gun.