Why do you want to drop those out of your diet? Health? "Ethics"?
I'm also thinking about dropping some meat out of my diet.
Mainly health reasons.
Also
Tuna -> too much mercury
Egg yolks -> dioxins
(I'll continue with egg whites.)
Red meat -> bad for heart/arteries
Milk -> generally not that good i've read, but i'll continue with yoghurt and cottage cheese (more protein)
So i'll mix up the chicken, fish (occasionally), and some vegetarian shit. Plus of course protein powder.