I had used designer before but it's not that good, likewise isopure, both use whey isolate, you want better? buy CFM whey protein but the very best is hydrolyzed whey ( dalton 520 ), you can get it at www.proteinfactory.com
but due to high US$ which is unfavourable to singapore$ I now bought my whey isolate from australian muscle, same quality as isopure ( 95% protein..0% fat), go for hydrolyzed dalton 520 and see how easy it is to cut down your body fat.BTW it taste bloody bitter!