Isopure
I agree with blaze. Isopure looks good on paper, but try drinking it every day. It tastes way too artificial and made me nauseous after drinking it for about a week.
My current favorite protein, though not zero carb and is cost prohibitive, is MYOMAX. I got their free sample tub($30 to $40 value!) though I believe that promotion is over.
I am surprised there is so little discussion of SciTek products, as they seem to be the real deal. Of course the $$$ is a big issue for regular users.