Check out All the Whey's subforum as well as True Protein. All the Whey offers some nice deals on isolates, blends, concentrates (with great flavors as well, I just ordered 5 lbs of Cinnamon Bun and 5 lbs of chocolate). True Protein has great products as well and offers a custom made formula option. Both companies also offer sample packs if you want to try the flavors before ordering a large amount which is very helpful.
Or if you just want to keep it basic but get quality protein head over to NutraPlanet and check out Optimum Nutritions Gold Standard Whey and Dymatize Elite Whey (I have used all the above mentioned products and you can't go wrong).