There are so many protein powders around. What's your favorite?

Years ago -- fifteen, maybe longer? -- we bought some sort of protein powder that was made by Shaklee. If I recall correctly, it was butterscotch flavored and the sales rep told us you could mix it with milk, water or anything, but his favorite was to mix it with orange juice. As odd as that sounds, it was really great. They don't seem to make it any more, though.

I haven't bought protein powder in a long time, but I'd like to try some again, but I don't know where to begin.