Prolab-Lean Mass Matrix/Cinnamon Oatmeal tastes great...followed by Strawberry banana MuscleMilk and Chocolate BSN Syntha-6
As far as quality...ON Pro-Complex or Dorian Yates Approved. Both taste good, and have the perfect blend of slow and fast releasing proteins.
I've always heard the Ergopharm GF Pro Proteins are excellent. They have fruity flavors like Green Apple, a cherry something, and Pink Lemonade