The brand isn't particularly important. What matters is the ingredient list and supplement facts panel.
All protein powders are not created equal. You really need to be a smart consumer in today's market and do your research. Look at the ingredient list and supplements fact panel on every supplement before buying it.
For a whey protein - you want to see nothing but that in the ingredients list. Whey protein, natural flavours, a natural calorie free sweetener like stevia and then maybe some salt, soy lechitin and cocoa powder.
There are a lot of good products on the market. Check out the product the board sponsor n2bm.com makes called wheytobuildmuscle