Hi optimistic girl, here is a site that might help you, it is
www.bodybuilding.com and these whey protein powders are arranged from best seller down. 1. is best seller, 2 is second best seller, etc.
http://www.bodybuilding.com/store/wheytop.htmlbut, i honestly wouldn't worry about getting an "exceptionable" protein powder, they are relatively the same and serve the same purpose..good luck!
I cant find the whey protein that I have on this site, but it has 170 calories per serving and 25 g of protein...if you're looking to maintain weight, I would recommend a higher calorie protein drink...
the only thing i can honestly recommend is this "carb conscious" bar...it has 360 calories per bar, with 30 grams of protein, and its DELICIOUS!! i would live on it if i could, but they're a bit expensive and too high calorie for my slow metabolism.. (my problem is opposite of yours, i gain weight very easily). here is a link for them if you want to see:) happy noogling
http://www.bodybuilding.com/store/supreme/supremebars.html