WHEY protein Isolate

Hi,
I would like to buy some WPI and wondering what brand makes the best one.. and what are the key parameters to be checked when choosing WPI - for example, I see that NOW Foods have a WPI which contains over 89% protein (25 / 28gr)
that is more the all the others that I saw.. does it says that this product is the better one ? or it is not necesarily so..

Thanks!

go with the cytosport musclemilk. Check it out here

http://www.taylorsnutrition.com/inde...roducts_id=118

Look for CFM whey isolate. Good brands are NXCare's ISOXP, IsoPro by Nature's Best, Whey Iso burst by GNC....

Muscle Milk is great, but not an isolate, if you're looking for an iso, I'd go with one of those...

Max's WPI is the best bodybuilding one around - taste is good and muscle recovery is great.

Optimum 100% Whey Protein has been the top seller at Bodybuilding.com for at least two years while winning their Supplement of the Year award. It seems to work fine for me, but I don't take protein supplements everyday---only on weight lifting days or at the end of 100 mile plus ride days. I couldn't really tell you why it would be any better or worse than other brands of whey isolate, but there is a lot of product information available at that website.

Muscle Milk is also a big seller at bodybuilding.com website.