Muscle building

What are some good foods for building muscle? I've heard eggs are good. I'm guessing anything high in protein, but it's hard to find stuff that's also low in fat at the same time. And then there's plant vs. animal protein.

So far I've been quite successful eating a diet fairly high in protein, with moderate carbohydrates, and low fat. My body fat index has dropped (due to overall calorie restrictions), and I have bulked up at the same time.

I prefer meats like Tuna and Chicken or even Kangaroo, as they're fairly lean. Tuna contains Omega 3, which is one of the good fats to eat. Also egg whites do not contain the fat and cholesterol found in the yoke.