I like GNC's 50-gram slam. Vanilla is my preferred flavor, though chocolate is nice. I found banana to be too sickeningly sweet.

FYI, since your digestive tract can only digest about 25 gm. of protein at a time, you really get two servings out of one can. It's only 240 calories for 50 gm. of protein. It also has a lot of good nutrients/vitamins in it, too.