Re: Sights for a Sig P220
If you're carrying for CCW/Duty type purpose, I would suggest the Trijicon night sights. I would also say go with the triple green(as in all dots green) option. There are choices of yellow and orange. The other thought would be go with orange rear sight/green front, so your eye is directed toward the bright spot(front sight) as that is where your sharpest focus should be. My only caution to you is Trijicon only provides a five-year warranty on the orange, but a twelve-year on the green. FWIW
If it's just for fun-n-grins, then maybe go with some fiber-optic type sights. I have fiber optic on my competition pistol, but shooting indoors, they don't stand out too well for me! Shooting outdoors, even on a cloudy day, there is enough light for the green fiber optic to really stand out for me.
Good luck with your quest!
-G45