In our store, we recommend Brown Rice Protein Isolate from Growing Naturals as the best plant based solution. You can probably find it online even though they have been back ordered as a company for a month. It's organic, raw, sprouted, blah blah blah

but most important it's realistically priced unlike most plant based protein brands.
If you are going with whey just remember that the benefits of a natural pastured or grass fed cow generally are found in the fat content which most proteins eliminate. We do find though that sometimes clients with milk allergens perform better on a natural grass/pasture fed whey protein.
Hope that helps!