Well if vegetarian is ok for you, whey tastes better than anything vegan (and I am mostly vegan and avoid dairy). Nothing vegan gets as smooth and creamy.
If you have a Trader Joe's my husband loves their brand of chocolate whey. It doesn't have a bunch of artificial stuff added, just some cocoa powder, cane sugar and some vitamins I think.
I, too am looking for the perfect vegan protein shake still, so I will keep posted. The only one I like so far is Warrior Food (NOT Sun Warrior, which is more gritty and the sweetened have the awful stevia taste) Vanilla Enhanched. It does have stevia but it is undetectable, and is the smoothest brown rice protein I've found. I rarely need some, when going for a long hike or something, but I'd love to find something vegan to replace DHs whey protein.