I formulate my own custom recovery drinks by mixing a combination of sports drinks and protein powders.

Currently I use Cytomax and several different protein powders. When ever I shop for a new batch of protein powder I always wonder whether there is any difference of if I should simply buy the cheapest. I don't really care much about taste, I just want to know if anyone has an idea about or reason to believe a particular "whey" protein mix is better than another.

I don't consider soy protein to match up. Any comments?