NOW Foods Whey Protein
Get the unflavored protein, so you can make it whatever flavor you want. I was sick of chocolate protein powder tasting like a$$, but with unflavored you just add a teaspoon of cocoa powder and a little splenda, mix with milk and it tastes great. It does clump a little with cold milk, but get a blender bottle and that will solve the clumping issue.
After trying several brands of whey powder, I rate NOW Whey Protein Isolate powder #1. Each serving has 25 grams of protein with very few additives.