Taking 10 more grams of whey protein postworkout or making your shake with 16oz milk instead of water is probaly more effective, it gives you more BCAA's and essential aminos. I weigh about 110kg at 1.78m, my bi's are about 46 cm. An old article by Charles Poliquin explained how he used BCAA's and he said anything under 15g taken immediately before or during a workout is a waste. IMO, if you're waiting until after your workout to take BCAA's it's too late, their primary use is during workouts. If cost is an issue you're better off adding more protein than just individual amino acids.