I've tried 2 brands that were good - one is Soldat's Whey To Go (I think the brand is the right name but I know the product is the right name) which is pretty good but very basic 100% whey protien shake (which means you might want to add some sweetener if you like it sweet) but the vanilla bean is very authentic tasting. Also, I've bought EAS which is also pretty good.

Hope that helps,
Tam