I use Warren 2 dot setups on my M&P's, but have no pictures yet. During the day, you probably won't notice the dot in the rear sight. Its small and doesn't draw your eye away from the front.
If you want the 2 dot setup, those are about as good as they get, and IMHO they're my favorites. The rear sight is designed to be "out of the way", but will still give you every opportunity to shoot accurately.
The only other sights I'd be looking at (and will be putting on my CCW M&P9C) are Ameriglo Operator sights. They're three dot so a bit different than my warrens, but have a slightly wider notch in the rear to give you that nice big front to let your brain focus on. They have tritium in the rear, but without the white dots, so during the day rear is just as good as a blacked out sight.