I tend to think that egg is the best. You don't get the gunky immune response that milk gives you, and it's a complete protein. 1 TBSP is 50 calories and 11.5 grams of protein. No carbs, no fat, no cholesterol, nothing added to the dried egg whites (depending on what brand you get). Doesn't have a taste, so you're not covering anything up with sweeteners, artificial or otherwise. It's a bit more expensive at $65 for 10 lbs, but I only go through 20 lbs a year using 20 TBSP per day, which is about $0.33/day.
I wouldn't use soy, almost all soy is genetically modified these days, in addition to the other detrimental health effects.
"What does the Lord require of you? To act justly, and to love mercy, and to walk humbly with your God". --Micah 6:8
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