I really like the isolation protein from n2bm.com. It is the only pure whey isolate protein I have found that is naturally flavoured and sweetened with the non-caloric natural sweetener stevia. I try to limit the amount of artificial things I put in my body and most protein powders are full of artificial flavours, colours and sweeteners.
26g protein, 1g carbohydrate and 0g fat per serving. It truly is the Rolls Royce of protein powders. Tastes great too.